By Rainbow Products



Part # R171070

Warranty 1 Year

Alternate Part #'s 42-196-1040, PENR171070

Product Description

The Pentair Rainbow 300 series is a commercial chemical feeder that is very durable and highly reliable. Each 300-29X model feeder is equipped with a heavy duty control valve (1/2 inch) and tubing that optimizes flow and erosion to provide larger amounts of sanitizer for commercial applications.



  • Heavy duty 1/2 in. control valve
  • Dispenses 8.5 lbs. of 1-inch Trichlor in 24 Hours.
  • Holds 29 large or 237 small chlorine tablets.


  • Treats 80,000 to 322,000 gallons of water.
  • Dimensions: (H) 38-1/2 in. x (W) 7 in. x (D) 12 in.
  • Service Clearance for Lid Removal: 39-3/4 in.

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

Product Specifications

Large Tab Capacity:
29 Tablets
Small Tablet Capacity:
14.5 Lbs.
Treatment Capacity:
80,000-322,000 gal.

?     Asked on 3/10/2007by 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 

?     Asked on 1/30/2012by 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 5/9/2015by Evan

I am looking for a heavy duty chlorinator after going through many Hayward units. Can this model be used with a 25k gallon pool and is it built better than simply the 300. Thanks.

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

The 300-29X would not be built any stronger than the 300 the only difference is that the 300-29 has an extension so it can hold more tablets than the 300. I do like the Rainbow 300 better than Hayward Chlorinator as it seems to be a little more durable.

?     Asked on 6/3/2015by Robert

If I take the flow control dial out of the system, I get more flow than if I have the dial in the system and set to maximum. Is this normal? Or is the control dial supposed to have a level of restriction even at maximum setting? If I set the dial to maximum, should I have the same flow rate as if the dial wasn't even in the system?

A  Answered on 6/13/2015 by InyoPools Product Specialist Lennox H.

Robert, The flow control does put restriction on the flow through the chlorinator even if you have the dial set to max.

?     Asked on 5/29/2017by DON

I have several of the free standing Rainbow chlorinator's installed on my pool route pools. The last couple of years, I have had to replace dozens of the check valves; often times weekly because the little ball jams. This is costing me a small fortune. Has the manufacturer changed in the last couple of years? I would not use this chloriniator if their was something else. I have not heard much good about the Hayword chlorinator either. Any ideas?

A  Answered on 6/3/2017 by InyoPools Product Specialist Lennox H.

Hi, Don. I'm not aware of any changes made to the check valve used in the Rainbow 300 chlorinator. I' not sure you'll have better luck with the Hayward CL220 but it might be work looking into. Other than that I do not have any other ideas or suggestions.


Est. Repair Time

Less than 1 hr

Tools Needed

Screwdriver, Socket Set, wire cutter to cut plastic tube

Replaced old chlorinator

Written on 6/27/2017 by Guest

Quite easy. Removed old parts and installed new parts exactly. After removing old hoses, cleaned PVC pipes and installed new tubing. All parts cam with the new chlorinator. Checked for leaks, tightened everything, and enjoyed new chlorinator.

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