Rainbow 320 Inline Chlorinator - R171096



Model # R171096

By Rainbow Products

  4.69 Average  



Model # R171096

Warranty 1 Year Warranty

Product Description

Spend more time enjoying your pool and less time on maintenance.  The Rainbow 320 inline chlorinator is the simple and reliable way to sanitize your pool.  Plumb this unit inline with your pool or spa return line, fill with chlorine or bromine tablets, and set the control valve to the desired amount - it's that easy.  No more putting harsh chemicals into the skimmer which can harm your pool equipment.  No more swimming with a floating dispenser in the way.  The corrosion-proof Rainbow 320 canister holds 11 large (3 inch) or 98 small (1 inch) slow-dissolve Trichlor or bromine tablets.  Bottom feed design can also be drilled and tapped at the top of unit for increased chemical dispersion.


  • Comes standard with 2" slip PVC pipe fittings
  • Includes slip adapter for installation on 1-1/2" pipe
  • Uses slow dissolving Trichlor or Bromine tabs and sticks
  • Heavy-duty 1/2 in. control valve and a replaceable 1/2 in. check valve/elbow
  • Bottom feed line with option for top feed if additional chemical levels are needed
  • Top feed 1/2 in. x 18 in. extension tubing is included
  • Optional cap wrench and corrosion-resistant check valves available


  • Sanitizes 6,500 - 27,000 gallons bottom feed or 18,000- 70,000 gallons top feed
  • Dimensions: 17-3/4 in.(H) x 5 in. (W) x 10 in. (D)
  • Service clearance for lid removal is 19 inches

* Note: Consult your local authority to determine their guidelines if needed. Results may vary due to pool/spa equipment and many other factors.

Product Specifications

Large Tab Capacity:
Small Tablet Capacity:
Typical Order Qty.:

?     Asked on 6/10/2020 by Rick

My pool pvc piping is labeled 2". Will this not work with 2" pvc?

A  Answered on 11/24/2020 by InyoPools Product Specialist Hector F.

Hi Rick, yes this chlorinator will work with 2 inch PVC plumbing. 

?     Asked on 4/29/2020 by John S Jones

Do you install the chlorinator between the pump and the filter or after the filter

A  Answered on 5/5/2020 by InyoPools Product Specialist Alex V.

John, The chlorinator would be the last thing that is plumbed in before the return. If you have a heater, it would be installed after the heater. If you don't have a heater, it would go after the filter. You will also want to install a check valve or plumb in a loop to prevent backflow from the chlorinator when the pump is turned off. 

?     Asked on 10/30/2019 by Jeff Chorba

I Just received a 320 installed into my pool by my service company here in Florida. I would like to know how long the warranty is good for and if there is some warranty form you can send me to fill out?

A  Answered on 10/30/2019 by InyoPools Product Specialist Megan C.

The Rainbow 320 Inline Chlorinator - R171096 is listed under the sanitizer category as a one-year warranty with a certified installer competing the installation. Please view link http://images.inyopools.com/cloud/documents/limitedwarrantycard-2.pdf for the warranty card.

?     Asked on 6/28/2019 by rob

i have a 500 gal pool w/ the 320 but seems to raise the cl2 to, does it matter the amount of tablets in the chlorinator the I've been keeping it full.

A  Answered on 6/28/2019 by InyoPools Product Specialist Lennox H.

Hi, Rob. The amount of chlorine in the chlorinator will determine how much chlorine is released into the spa. The more tabs in the chlorinator the more chlorine is released. 

?     Asked on 5/2/2019 by

What kind of ball valve should I use to slow the flow rate down. I have a 2000 gallon spa and stays at 100 degrees 24/7. If I add one tab to the chlorinator it shoot the levels through the roof overnight and that's just barely opening the valve.

A  Answered on 5/3/2019 by InyoPools Product Specialist Michelle B.

Hello, What is the size of your PVC plumbing?

?     Asked on 5/1/2019 by Tom

I have a 20 year old Rainbow Lifegard Model 320 #R171099. Will the new feeder screw onto the tee?

A  Answered on 5/3/2019 by InyoPools Product Specialist Lennox H.

H, Tom. Yes, you can since not much has changed in the past 20 years. 

?     Asked on 4/20/2019 by Tim

Is this a good choice to be paired with the Pureline Prive VS 1.65 HP pump? Will the Rainbow supply enough chlorine at low speed settings?

A  Answered on 5/6/2019 by InyoPools Product Specialist Michelle B.

Hello, Yes, this will be a good option with that pump.

?     Asked on 4/15/2019 by Tim

I'm using a 320 for a 1000 gallon Spa and the Bromine levels are always high do they make a 1000 gal. chlorinator or is there something i can use to slow the flow?

A  Answered on 4/16/2019 by InyoPools Product Specialist Joe S.

Good afternoon, you can add a ball valve to decrease the flow or would just be adding smaller amounts or bromine to the system.

?     Asked on 2/12/2019 by Richard

Is it normal for the tower to always be filled with water ? If not where should the water level be ?

A  Answered on 2/12/2019 by InyoPools Product Specialist Michelle B.

Hello,Yes, that would be normal.

?     Asked on 12/12/2018 by jeff

after installing chlorinator I noticed an arrow pointing for water flow . the arrow is pointing toward my filters . that seems to be backwards . does it matter which way chlorinator is flowing . or do I have to reinstall the other way ?

A  Answered on 12/13/2018 by InyoPools Product Specialist Lennox H.

Hi, Jeff. Yes, it matters which way he arrow is pointing, you will have to reinstall the chlorinator the correct way. 

?     Asked on 7/30/2018 by Jeremy Al Rampy

does it matter if the valve was installed at the top of the feeder versus the bottom as all pictures show it? My pool guy installed our new chlorinator with the valve at the top and plug at bottom.

A  Answered on 8/4/2018 by InyoPools Product Specialist Lennox H.

Hi, Jeremy. It does not matter which port is used. The top port is used in high flow applications. 

?     Asked on 7/11/2018 by NT

Hello, what is the max flow this chlorinator can handle? Pad is 2.5” and then goes to 1.5” before going to 3 returns, water slide and 3 waterfalls. Can I place the chlorinator right after the filter and before everything else? Or should some water features be bypassed? Thanks

A  Answered on 7/14/2018 by InyoPools Product Specialist Lennox H.

Hi, NT. This unit using the bottom feed port max flow rate is19 GPM and using the top feed is 48 GPM. The chlorinator should be placed after all other equipment with a check valve. 

?     Asked on 5/9/2018 by Donald Appel

If I want to use the top feed i would run the longer pipe from the top to the valve. I would leave the valve where it is on the chlorinator. Is this correct?

A  Answered on 5/9/2018 by InyoPools Product Specialist Lennox H.

Hi, Donald. You will have to move the valve to the top and plug the bottom. Instruction are available in the SPECIAL FEATURES AND INSTRUCTIONS section of the Rainbow 320 InLine Chlorinator Owner's Manual

?     Asked on 5/6/2018 by Preston

Had Rainbow 320 installed and I have it turned all the way up. The chlorine level will not go up. I keep having to put tablets in the skimmer or shock the pool to get it up. The tablets are dissolving in a few days inside the unit. How do I know if it is getting the chlorine delivered.

A  Answered on 5/9/2018 by InyoPools Product Specialist Megan C.

If the tablets are dissolving and you cannot keep a good balance on the chlorine level you may have to much cyanuric acid in the water. Please view How To Break Chlorine Lock Link http://www.inyopools.com/HowToPage/how_to_break_chlorine_lock.aspx and have the water tested with a professional. 

?     Asked on 4/15/2018 by Ann

Have been running this one week. Even on a 1 for a 15,000 pool it is maintaining too high a chlorine - over 5PPM What now?

A  Answered on 4/18/2018 by InyoPools Product Specialist Lennox H.

Hi, Ann. You will need to reduce the amount of chlorine tablet in the unit. Also, monitor the pool water temperature. The colder the water the less chlorine you'll need. 

?     Asked on 1/27/2018 by Jim

how close can the pentair check valve be installed to the pentair 320 chlorinator i have a total of 10. 5" of actual pipe between filter and a tee? thanks jim

A  Answered on 1/29/2018 by InyoPools Product Specialist Lennox H.

Hi, Jim. The check valve should be installed with 6" of straight pipe between the feeder and the valve.

?     Asked on 11/7/2017 by DAX SOMEILLAN

I have a pentair automatic chlorine bromine in line feeder MODEL 320 model R172276 has that model been replaced by a newer model? It has a set screw and can be removed by taking set screw out and taking unscrewing the canister.

A  Answered on 11/7/2017 by InyoPools Product Specialist Lennox H.

Hi, Dax. The 320 Chlorine/Bromine unit is still available. The R172276 is the model of the Flow Indicator - R172276 which is also still available. 

?     Asked on 9/18/2017 by Laurie Bellows

i have a 37000 gallon pool. How long should I have to run my pool to get the bromine to the level it should be?

A  Answered on 9/19/2017 by InyoPools Product Specialist Lennox H.

Hi, Laurie Bellows. It's hard to say how long. It depends on how much bromine is in the unit, the flow rate of the pump etc. Also, bromine can not be stabilized so it's will not remain in the pool for a long time so it will have to be continually circulating. 

?     Asked on 8/18/2017 by Walt

I have a lifeguard 320 inline chlorinator which looks like the rainbow 320 it is 28 years old and failing. Can I replace it with the rainbow 320 without any "mainline" retrofits? It looks to be about the same unit. Thanks Walt

A  Answered on 8/18/2017 by InyoPools Product Specialist Lennox H.

HI, Walt. Since your current unit is 28 years old, the new style chlorinator will not fit so you will have to replace and replumb a new 320 Chlorinator. 

?     Asked on 7/5/2017 by G. Degioanni

Is this the proper chlorinator for a 33000 gallon in ground pool?

A  Answered on 7/6/2017 by InyoPools Product Specialist Lennox H.

Hi. This Rainbow 320 Inline Chlorinator is sufficient for a 30,000 gallon pool. 

?     Asked on 6/17/2017 by

low valve is not working properly. defective.Also need insalation inst, this is for a pentair rainbow chlorine feeder modle 320

A  Answered on 7/23/2017 by InyoPools Product Specialist Alex V.

Hello, You can view the owner's manual under documents tab on the item page. It will have some basic troubleshooting that you can perform as well. 

?     Asked on 5/18/2017 by

Why does my current chlorinator run dry and suck air into the system?

A  Answered on 5/19/2017 by InyoPools Product Specialist Lennox H.

Hi. Your cholrinator is dry because water is not flowing through the unit. The chlorinator is on the pressure size of the system so it's unable to suck air into the system. The problem is on the suction side of your system. To troubleshoot this issue, follow the steps in out How to Identify and Correct Air Leaks guide.

?     Asked on 5/9/2017 by Jimmy Voight

I have a 20 year old Rainbow Lifegard model 320 chlorine feeder. Was clean it out in that debris was in the check valve. When cleaned it out buy takening apart I noticed that the Lock screw was screwed all the way through the cannister. Is this correct?

A  Answered on 5/10/2017 by InyoPools Product Specialist Lennox H.

Hi, Jimmy. It is okay if the screw goes all the way through the tee.

?     Asked on 4/13/2017 by

I have a Rainbow chlorinator #320 but have noticed the tube doesn't fill with water as others have described. I can feel water movement through connector tube and at base. What could be the issue. The equipment is only 8 months old. Thanks

A  Answered on 4/13/2017 by InyoPools Product Specialist Lennox H.

Hi. The issue could be that you do not have enough water flow, the unit is clogged or the unit was not installed properly with 6" or of straight pip on either side.

?     Asked on 10/13/2016 by Andy

I Have a Rainbow chlorinator # 320 I need 2 R172272 1/2 " NPT X tube fitting with nut. Do you have one that you can overnight to me? Help!!

A  Answered on 10/13/2016 by InyoPools Product Specialist Scott W.

Yes, it is in stock, but at this time it would not get out today. It would get shipped out tomorrow so if you next day aired it, it would not get to you until Monday.

?     Asked on 10/12/2016 by Joyce Oikle

I have a pentair model 320 inline pool chlorinator that is leaking where the base is attached to the threaded T fitting. Is there a o-ring or gasket there that might be leaking, and if so , how do I replace it?

A  Answered on 10/12/2016 by InyoPools Product Specialist Alan M.

Hello Joyce- here is a link to the Rainbow 320 Parts Diagram. In the diagram, I would like you to look at 17, 18A, 21, and 22 on the diagram. To access this area, you would need to remove #18A, the locking screw. This will allow you to access the #17 o-ring between the #22 Tee and the tube. You would need to order #17 O-ring, Bottom-Inline (128).

?     Asked on 9/26/2016 by Dale

How much pressure is required for this chlorinator. I approached my pool builder about a 2 speed pump so I could run the filter pump / chlorinator just as long but not use as much electricity, and he said the 2 speed pump did not provide enough pressure for the chlorinator?

A  Answered on 9/29/2016 by InyoPools Product Specialist Scott W.

Your pool guy is probably concerned with the decreased flow rate which will cause the chlorinator to produce less chlorine than when it is on high. I am guessing he is concerned with your pool turning green due to not enough chlorine being applied to your pool.

?     Asked on 9/5/2016 by joe muscolino

The o ring for the cover had dried out. Can I buy one? Thanks Joe

A  Answered on 9/7/2016 by InyoPools Product Specialist Lennox H.

Hi Joe, We do have the Cap O-ring (Viton) (R172009) for this unit available for purchase.

?     Asked on 8/28/2016 by jim

will this work on a water well

A  Answered on 9/16/2016 by InyoPools Product Specialist Lennox H.

Hi Jim, This chlorinator can be used to on a well water system.

?     Asked on 8/27/2016 by

I’ve a 320 inline chlorinator and it’s bottom feed. No matter how high I set the feed dial the free chlorine is always low. I set the feed dial to 0 off, removed the lid and turned the pump on and the tube filled with water in seconds and started to overflow. I shut the pump down and the tube drained slowly. Is there anything wrong with the chlorinator? Thanks!

A  Answered on 8/30/2016 by InyoPools Product Specialist Stacey M.

Hello, how long have you had your chlorinator? If it's more than 3-4 years old and you haven't replaced the feed tube it could be caked up with residual chlorine. Feed tube and parts are here.

?     Asked on 8/1/2016 by BRAD SILL

the length of damage hose is about 8 inch. the new is 18. just leave the whole hose in and not cut it down

A  Answered on 8/1/2016 by InyoPools Product Specialist Alan M.

You will need to cut the larger hose down to replace the damaged one. I would recommend removing the old hose and using that length as a template for trimming the new tube.

?     Asked on 7/27/2016 by zahir akbar

dear Sir/Madam Good Day Please i want to know the mentioned part model no. Rainbow 320 Inline Chlorinator - R171096 - how much one pc. weight? please reply me my mail

A  Answered on 7/27/2016 by InyoPools Product Specialist Alan M.

Hello, The weight of the chlorine feeder is approximately 7.5 lbs.

?     Asked on 6/25/2016 by Claire Caputo

the nob and hose assembly on the outside of my rainbow lifegard model 320 inline chlorinator has a small leak. Is this part sold separately or do I have to purchase a new chlorinator?

A  Answered on 6/25/2016 by InyoPools Product Specialist Scott W.

You're able to purchase the individual parts for that. Here's the part diagram for that chlorinator so you can identify which parts you're needing to replace.

?     Asked on 6/23/2016 by Tommy

Can I just get the valve for the 320? or do I have to order the whole assembly?

A  Answered on 6/24/2016 by InyoPools Product Specialist Alan M.

Here is a link to the Rainbow Inline Chlorinator Parts for your reference in the event you need any additional parts. The valve, Valve, Control 1/2"fpt (r172086) show that it is in stock and includes free shipping.

?     Asked on 5/29/2016 by Margaret

Can the rainbow 320 be used on salt water pool?

A  Answered on 5/29/2016 by InyoPools Product Specialist Matt S.

Yes, it can, but if you have a salt chlorine generator, an offline chlorinator should not be necessary.

?     Asked on 5/24/2016 by Wanda Hysmith

Does this chlorinator come in a clear feeder

A  Answered on 5/24/2016 by InyoPools Product Specialist Patrick P.

Hi Wanda yes here is the Rainbow 320 Clear Chlorinator.

?     Asked on 4/12/2016 by Pat

I have a Rainbow 320 inline chlorinator on my 14,000 gallon in ground pool with a ozonator. The pool and equipment was installed in 2009. The 320 seems to be working properly; water drains when opens, fills when turned on and the tablets are dissolving etc, but no matter how high I set the feed dial the chlorine is always low. Could there be something plugged that needs servicing?

A  Answered on 4/13/2016 by InyoPools Product Specialist Lennox H.

Hi Pat, A few things that you can check: (1) the Screen on the bottom of the unit (2) the Check Valve. You can also try pouring hot water down the chlorinator, that can clear the lines of any blockage due to chlorine build up.

?     Asked on 2/27/2016 by

I have a Rainbow 320 in-line chlorinator, my tablets are not dissolving. There is water in the unit. What could be the problem?

A  Answered on 2/29/2016 by InyoPools Product Specialist Hector F.

There could be a number of issues that can cause these tablets to not be dissolving. There could be a pinched hose, clogged chlorinator, or even insufficient flow from an equipment issue. I would advise to trouble shoot all of the above and if no success consider having  a technician inspect the system.

?     Asked on 2/21/2016 by Wes

Is this the same product as the Porpose No. 320 Chlorinator?

A  Answered on 2/22/2016 by InyoPools Product Specialist Hector F.

The Porpoise 320 chlorinator looks to be nearly the same exact chlorinator.

?     Asked on 8/10/2015 by Charlie

I need to lengthen the hose on my chlorinator. What hose is used? I want to make sure to get something that is chlorine resistant. Thanks!

A  Answered on 8/10/2015 by InyoPools Product Specialist Robert M.

Hello Charlie - We sell 8' sections of the chlorinator tube. Part number R172023 (6704-0) is the correct tubing.

?     Asked on 8/4/2015 by

Bought a new rainbow 171016 clorinator. Instructions show no screen in bottom. my old one had one. Do the new ones not use it?

A  Answered on 8/6/2015 by InyoPools Product Specialist Lennox H.

Hi,  The Rainbow Chlorinator 171016 which is the offline model does not use the bottom screen.

?     Asked on 7/31/2015 by

I have a 12,500 gallon in-ground pool. How many tablets should I put in the Pentair 320 at any one time? Do I fill it up or use a n umber associated with the size of my pool?

A  Answered on 8/4/2015 by InyoPools Product Specialist Lennox H.

Hi, You can fill up the chlorinator but set it on 1 or 2 depending on where you want your chlorine level to be. Also you would want to monitor the CYA level of your pool, if high reduce the amount of tablets and set at a higher output level.

?     Asked on 7/23/2015 by Ross

I have a variable speed pump and there is not enough water coming into the unit as these pumps are designed to save money by running at a lower speed. I don't want to run the pump higher just to get water into chamber.

A  Answered on 7/24/2015 by InyoPools Product Specialist Lennox H.

Hi Ross, Variable Speed Pumps are designed to run on a low speed to save money, however certain equipment need a certain amount of flow to operate properly. If at the current speed your pool is being properly chlorinated then it's ok.

?     Asked on 7/16/2015 by Lisa

do I need to recharge my chlorinator everytime I open the lid to check it?

A  Answered on 7/16/2015 by InyoPools Product Specialist Hector F.

I recommend refilling the chlorinator if and when the pool chemistry calls for it. If the chlorine level is maintaining a high level then either add less or none until that level lowers a bit. If low then a shock and refill is necessary. If its maintaining a level chlorine reading then yes refill.

?     Asked on 5/10/2015 by Norm

I brought a replacement flow regulator and it will not quite fit onto the existing threaded spigot on the main body of the chlorination. Is this a common problem?

A  Answered on 5/11/2015 by InyoPools Product Specialist Patrick P.

Norm, this is not a problem we have run across. Can you double check that your chlorinator is indeed a Rainbow 320?

?     Asked on 5/6/2015 by Paul

Is the Rainbow 320 Inline Chlorinator a direct replacement for the Lifegard No. 320 chlorinator?

A  Answered on 5/7/2015 by InyoPools Product Specialist Andy O.

Paul- The Rainbow 320 will be a direct replacement for the Lifeguard 320.

?     Asked on 4/5/2015 by

I have a 320 auto cholinator tank fills all the way up and overtop, pool chlorine very high, setting at 1, what causes this ??

A  Answered on 4/6/2015 by InyoPools Product Specialist Robert M.

If this is a new problem, the control valve may need to be replaced. Part number 2114-04 is the correct control valve.

?     Asked on 2/6/2015 by Byron

Can I buy parts for model 320 chlorinator? The seal has gone bad for the screw off top.

A  Answered on 2/6/2015 by InyoPools Product Specialist Brian M.

You may certainly buy parts for the Rainbow 320 chlorinator. Please click on the previous link and see all the part that are available to you. THe o-ring for the top cap, in particular, is #2 on the diagram.

?     Asked on 1/30/2012 by Guest

What is the difference between an inline and offline chlorinator?

A  Answered on 1/30/2012 by InyoPools Product Specialist Patrick P.

An inline chlorinator would be plumbed directly inline with the plumbing.  For an existing pool, this would mean a section of pipe would need to be cut out to install the chlorinator.  An offline chlorinator attaches to existing plumbing by chlorinator tubing (holes would be drilled into existing pipe to attach the tubing.)

?     Asked on 3/10/2007 by Guest

Is there a feedback mechanism that tells the unit the chlorine balance in the pool? Is this a way for me to automate addition of clorine to keep it always at the correct level? Or, just another place to put the tab aside from the the drain basket?

A  Answered on 3/10/2007 by InyoPools Product Specialist Patrick P.

There is a dial on this unit which has a setting from 1-10 If you set the dial on 1 it will be letting the least amount of chlorine to the pool and if you have it set at 10 this would send the most amount of chlorine to the pool. So you can automate the feed of chlorine to the pool but you will still need to manually test your water. We do not recommend placing tablets in the skimmer basket because this high concentration of chlorine goes directly back to your pump and can cause corrosion to your pool equipment. If you do not go with the automatic chlorinator we would recommend at least going with one of our floating chlorinators so you do not damage your equipment you may view our floating chlorinators here http://www.inyopools.com/chlorinators_floating.aspx 


Est. Repair Time

1 to 2 hrs

Tools Needed

pvc cutter and glue

2     0

I wanted to have a inline chlorinator to make things easy.

Written on 1/25/2018 by Guest

I shut down the pump and relieved the pressure on line.Due to it being a chemical I also wanted to install a 2 inch check before the chlorinator.When u do this make sure valve is chemical resistant.After a coupling was used I tied in the chlorinator..Then glued in the last coupling.I let it set and started it up after adding 5 3 inch tabs.I started it on the lowest setting and went up from there.It works great!! I saved nearly300.00 by ordering it from INYO supply.

Thanks guys

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