Pool Salt System 40,000 Gallons LT - PL7709


Part # PL7709

By PureLine

  4.8 Average  



Part # PL7709

Warranty 1 Year

Product Description


Crystal Pure Salt System by PureLine

The PureLine Crystal Pure Salt System makes the process of chlorinating the pool a breeze for you. When your pump runs, you will be producing chlorine, ensuring a steady dose into your pool water. The more consistent your chlorine levels are in your pool, the fewer chemicals you will use overall. Free yourself and your pool guests from the itchy, dry feeling of regular chlorine. With a salt water chlorine generator, the water feels smooth and won't leave a white residue on your skin. The Crystal Pure generator cell easily plumbs in-line and has quick disconnect unions for easy access. 


  • Durable design
  • Max. Chlorine Production Per Day = 2.1 Lbs.
  • Economical to use
  • Simple operation & maintenance
  • Large chlorine capacity
  • Low energy consumption
  • 1 Year warranty
  • Digital display and LED indicators
  • Self-cleaning
  • Adjustable chlorine output
  • Super chlorination mode
  • Water flow detector
  • Low salt and overload indicators
  • High & low temperature protection (working temperature from 50F to140F)

Crystal Pure Optional Add-On Accessory Package

The Crystal Pure Optional Add-On Accessory Package includes several convenient tools for your swimming pool salt system. The package includes a Salt Cell Cleaning Stand, Salt Test Strips, and a Dummy Cell. The Cleaning Stand simplifies cell cleaning and eliminates having to soak the cell in a bucket of muriatic acid solution. Salt Test Strips are used to accurately measure the salt level in your pool. The dummy cell is used during cell cleaning, winter, and spring startup.

Optional Add-On Accessories

Salt Cell Cleaning Stand

This cleaning stand simplifies cell cleaning and eliminates having to soak the cell in a bucket of muriatic acid solution. This Cleaning stand is used for PureLine Crystal Pure salt cells. You should clean your salt cell every 2 months to avoid calcium build up on your salt cell. By cleaning your salt cell regularly you will prolong the life of the cell. Also if you get too much calcium build up on the salt cell then the system will stop producing chlorine, regular cleanings ensure that your salt system will not stop producing chlorine.

Order Your Salt Cell Cleaning Stand

Salt Test Strips

Salt Test Strips are used to accurately measure the salt level in your pool. The Crystal Pure Salt System does measure and give salt readout levels on the power supply however it is nice to have salt test strips upon startup of your Salt System. During startup up you will use your test strips to make sure that you add the correct amount of salt to your pool, it is also good to be able to compare the salt readings on the power supply to those of the salt test strips to make sure the system is giving accurate salt readings. 

Straight Pipe Place Holder - Dummy Cell

This straight pipe holder also called a dummy cell is used for several scenarios which we have listed below.

Winter: It is suggested that in areas of the country that you close your pool for the winter that you replace your normal cell with this dummy cell, the reason being is that the standard cell is expensive and by removing the standard cell you will prolong the cell's life.

Cell Cleaning: When you remove your normal cell for cleaning it is nice to have the dummy cell as you can replace the normal cell with the dummy cell so you continue to filter your pool while you clean your cell.

Spring Start-Up: The dummy cell is great to use during spring start up as quite often the pool can be quite dirty and you don't want large dirt and debris to get lodged in your standard salt cell.

Order Your Dummy Cell

Product Specifications

Gallon Size:
40,000 gal.
1 yrs

?     Asked on 9/12/2019 by Eric McAlpine

Have this unit. Is there a blank available to swap for the cell during the winter?

A  Answered on 9/12/2019 by InyoPools Product Specialist Hector F.

Yes you can use the cell dummy part number 2807-17 in place of the cell if you would like to remove it for the winter. 

?     Asked on 7/31/2019 by Brenda roosevelt

If this does not fit our replacement generator, it is a final sale?

A  Answered on 7/31/2019 by InyoPools Product Specialist Matt S.

As long as the product is returned in unused, resellable condition. You can also review our complete return policy.

?     Asked on 7/16/2019 by JACK

whats the warrant on the control box mine srarted smoking

A  Answered on 7/16/2019 by InyoPools Product Specialist Lennox H.

Hi, Jack. This unit is warranted for (1) one year. 

?     Asked on 7/1/2019 by Virginia

When the salt cell dies on this system, cann you replace it with a better cell? I'm replacing another system that died, ended up with a massive algae growth (of course I was out-of-town for 3 weeks when it died), and I am trying to limit any more hemorrhaging of my bank account for the moment. I'll be using it in a 20K pool, so I expect the 40K rating to help it last a bit longer.

A  Answered on 7/1/2019 by InyoPools Product Specialist Patrick P.

Hi Virginia, Yes when it is time to replace the cell you can replace with an upgraded cell. There is two options on the cell... first, there is the size of the cell (20,000 gallons, 40,000 gallons or 60,000 gallons) the larger the pool size the more blades inside of the cell which means you can produce more chlorine. 2nd is the warranty on the cell... the higher the warranty the more ruthenium coating on the blades meaning the longer the cell life. The 1-year warranty cell has a 5,000 hr. cell life, the 2-year warranty cell has a 7,000 hr. cell life and the 3-year warranty has a 10,000 hr. cell life. If you do upgrade to a larger pool size cell than make sure to change the cell size in your power supply to ensure your system works properly. Here is a link to the Crystal Pure Replacement Cells (key #1)

?     Asked on 6/8/2019 by Perry

I have a 18000 gallon gunnite Jandy pool system whose APURE 1400 chlorine generator has failed (according to my pool company). I have been treating the pool as a chlorine pool but am considering a return to salt. Would this system work for me? Will there be any replumbing? Do I need anything not included in this package?

A  Answered on 6/9/2019 by InyoPools Product Specialist Patrick P.

Hi Perry, I actually did this exact same thing on my pool (i.e. went from a Jandy AquaPure to a PureLine Crystal Pure) and have been really happy with the Crystal Pure. It has been a few years since I did the swap out but the cell length was a pretty close fit from the AquaPure to the Crystal Pure. The Crystal Pure comes with a whole bunch of adapters to accommodate many different plumbing sizes. I remember I did have to do a little bit of cutting and gluing of my pipe but it was very minor I think it might have been one cut since the PureLine was an inch or so longer or shorter, but overall it was quite easy. The PL7709 will come with everything you need for installation besides the salt. Also if you want to add a 115V Cord to the power supply that would be purchased separately.

?     Asked on 6/7/2019 by Ted Weiss

Hi. I understand if the water flow stops then the unit shuts off. My pump is on the timer, but the outlet that I am plugging this into is not. Is there a problem if I rely on the pump shutting off the flow, and therefore the generator? thanks!

A  Answered on 6/7/2019 by InyoPools Product Specialist Patrick P.

Hi Ted, No that is not a problem if you rely on the pump shutting off the flow.

?     Asked on 5/25/2019 by James

Hello. My timer is about 150ft away from pool pump area in my basement, what would you suggest for wiring control box and timer? Thank you.

A  Answered on 5/27/2019 by PureLine

Could you let us know the max watts for your timer, this should be listed on the timer? Also what is the amperage of the circuit the timer is on 10 amps, 15 amps or 20 amps? Will this be wired 115V or 220V? The answers to these questions will help us determine the proper wire for you.

?     Asked on 5/18/2019 by Jaime

I'm thinking about installing the salt system in my existing pool, which is currently winterized. I haven't started cleaning it yet. Does the pool need to be cleaned out and clear before installing the system?

A  Answered on 5/18/2019 by InyoPools Product Specialist Lennox H.

Hi, Jaime. It would be best to have the pool cleaned up prior to having the unit installed. 

?     Asked on 5/8/2019 by Roger Young

How many amps does this system pull on 240 volts.

A  Answered on 5/9/2019 by InyoPools Product Specialist Lennox H.

Hi, Roger. This unit uses 8 amps at 100% output. 

?     Asked on 5/3/2019 by Randy

I have a 20.000 gal plus above ground pool with 1.5" flex hose tubeing for skimmer, pump and return flow jets. Nothing is hard piped at this time. Does this product come with the proper fittings, couplings, and any other hardware needed for installation? Also do you have a video on how to install this system to an above ground pool with flex tubeing.

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

Hi, Randy. This unit includes the plumbing fitting for the cell installation. There is not a video that shows installation with flex tubing. 

?     Asked on 4/28/2019 by Rafael

I have a gunite pool. Do I have to do anything to the pool walls to convert to a salt pool?

A  Answered on 4/28/2019 by InyoPools Product Specialist Lennox H.

Hi, Rafael. You do not need to do anything to the walls of your pool to convert to a salt pool. 

?     Asked on 4/14/2019 by DAVID DeLeo


A  Answered on 4/14/2019 by InyoPools Product Specialist Lennox H.

Hi, David. Yes, 2" plumbing unions are included with this system.

?     Asked on 4/10/2019 by Mark

I have an auto chlorine feeder on my piping would that be were I put the salt generator or whatever it’s called

A  Answered on 4/10/2019 by InyoPools Product Specialist Patrick P.

Hi Mark, yes the salt cell would go in the place of the automatic chlorine feeder. Here is a Video on How to Install a Salt System which you may find helpful.

?     Asked on 4/10/2019 by Mark

I have a 20,000 gal in-ground pool what do you recommend I was always told to get bigger so it will use less salt

A  Answered on 4/10/2019 by InyoPools Product Specialist Patrick P.

Hi Mark, Yes we would always suggest bigger. The larger system won't use less salt, it will just run for shorter amounts of time meaning you will get much longer life out of your salt cell. Also if you ever get into an algae situation with the larger unit you can really crank up the chlorine production.

?     Asked on 4/8/2019 by

will this replace a pentair ic 40

A  Answered on 4/8/2019 by InyoPools Product Specialist Lennox H.

Hi. This system can be used to replace an IC40 system. We also have the Pureline IC40 Replacement Cell - PL7155 if your Power Supply still works. 

?     Asked on 4/6/2019 by Greg

Currently using Easy Pool to treat my in ground pool. I've read that there is no need to replace pool water when switching to salt water from a chlorine pool. Is the same true for someone using Easy Pool?

A  Answered on 4/9/2019 by InyoPools Product Specialist Patrick P.

Hi Greg, From my understanding, Easy Pool is just a proprietary blend of various chlorines so you would treat your pool like a standard pool meaning no need to replace any water when switching to salt.

?     Asked on 4/3/2019 by Matt w

I have a 26000 gal gunite pool with a sta rite de filter. The filter says not for salt water. Is this for warranty reasons or do I have to replace it to convert to salt?

A  Answered on 4/3/2019 by InyoPools Product Specialist Lennox H.

Hi, Matt W. I've only seen that warning with stainless steel body filters. Your filter will have to be replaced before converting it to saltwater.

  • Commented on 4/4/2019 by Product Owner

    Just for clarity this is the filter I have. What would happen if I used it for a year or 2? Sta rite system 3 model s7d75

    • Commented on 4/5/2019 by InyoPools Product Specialist Lennox H.

      Matt W, The System 3 DE Filter 37 Sq. Ft. - S7D75 can be used with a saltwater pool. I know pool equipments has a warning that stated for fresh water only. Please provide a picture of that warning label. 

    • Commented on 4/5/2019 by InyoPools Product Specialist Patrick P.

      From understanding, this warning is for seawater which is roughly 50,000 PPM and your filter would be fine for a standard salt pool which is at 3,000 PPM. They were putting these warning labels on filters prior to salt pools and has since drawn confusion. But in my opinion you will be fine with staying with that filter.

A  Answered on 4/25/2019 by Product Owner

I had same filter. Converted to salt 6 years ago. Filter worked fine. As far as I know it is still going strong.

?     Asked on 3/25/2019 by Ed

Can the cell be mounted vertically with the flow going down through it? I'd like to put it right at the outlet of my filter and before the valve that splits the flow into the 2 return lines, but there isn't a lot of horizontal space available. Can this be plumbed into a 1.5" PVC system?

A  Answered on 3/25/2019 by InyoPools Product Specialist Patrick P.

Hi Ed, Yes the cell can be installed vertically and it does come with the fittings to install into 1.5" plumbing.

?     Asked on 3/14/2019 by George Lee Mosley

I have a Hayward salt system.( for 40K gallon pool) Will this pureline fit in same spots on my existing piping system?

A  Answered on 3/14/2019 by InyoPools Product Specialist Lennox H.

Hi, George. Yes, this unit will be a drop in replacement. 

?     Asked on 2/10/2019 by Zach Honaker

I have a 28 foot above ground pool and want to convert it to salt. Will this system work for that?

A  Answered on 2/11/2019 by InyoPools Product Specialist Patrick P.

Hi Zach, this would be a perfect salt system for a 28' above ground pool and would be the one we suggest.

?     Asked on 1/20/2019 by rick

I am looking to convert from chlorine to salt system. would this system be what I need to convert? or would I need more parts for a full conversion?

A  Answered on 1/21/2019 by InyoPools Product Specialist Lennox H.

Hi, Rick. You will need other accessories like a Check Valve, and a Zinc Anode to complete the installation. Check out our How To Install a Crystal Pure Salt Chlorine Generator guide for more info.

?     Asked on 1/10/2019 by george sestak

i have a jandy aquapure pure1400,can i replace with this system? thank you

A  Answered on 1/10/2019 by InyoPools Product Specialist Patrick P.

Hi George, Yes you can use the PureLine Crystal Pure Salt System as a replacement for the Jandy AquaPure. You may have a little bit of plumbing to do but it should be minor. One thing of note is that if you have a Jandy AquaLink control system where you control all of your pool equipment from inside your home then you will not get salt readings on the indoor control panel. In conclusion, I think this would be a fantastic replacement for your Jandy Aqua Pure.

?     Asked on 7/16/2018 by Chuck Osborn

I have a Hayward Goldline Prologic Automation and Chlorination system which runs the pool pumps, spa pump, lights, cleaner, and salt system. Apparently, the salt part of the system is no longer working, and I was told I needed to replace the entire circuit board. If I purchased your system, would it integrate with the Goldline system, or does it completely replace that system?

A  Answered on 7/21/2018 by InyoPools Product Specialist Lennox H.

Hi, Chuck. Unfortunately, this system will not be able to integrate with your ProLogic Controller. This will be installed as a standalone piece of equipment. 

?     Asked on 7/16/2018 by

Can I replace my Aquarite with little or no trouble with this system?

A  Answered on 7/16/2018 by InyoPools Product Specialist Lennox H.

Hi. Yes, you will be able to replace your Aquarite system with little trouble. 

?     Asked on 7/4/2018 by Richard

What are the differences between 7700 and 7709 models?

A  Answered on 7/5/2018 by InyoPools Product Specialist Hector F.

The PL7700 has a 2-year warranty because the metal plates in the cell have more coatings giving it more durability. The PL7709 model has less giving it a one year warranty. 

?     Asked on 6/22/2018 by greg

what is the average cost to switch to a salt water pool system?

A  Answered on 6/22/2018 by InyoPools Product Specialist Andy O.

Hello Greg- The only expenses when switching over to salt will be the Chlorinator and however much salt you will need to get your pool to the correct salt level. Here is a blog that will help: http://www.inyopools.com/Blog/converting-your-pool-to-saltwater/.

?     Asked on 6/19/2018 by Jim Petrocelli

I have a variable speed pump will this work with the reduced flow rates when it dials down

A  Answered on 6/19/2018 by InyoPools Product Specialist Joe S.

Good morning Jim, yes this will work with a variable speed pump. It would need to run at least to achieve the 30 GPM to activate the flow switch. At RPMS that would be around 1700-2100. 

?     Asked on 6/17/2018 by Gerald

I don't see the specs for the SWG. What is the required or minimum flow rate (gpm) for this SWG. Thanks Gerald

A  Answered on 6/18/2018 by InyoPools Product Specialist Joe S.

These units will need a minimum of 30 GPMS to operate the flow switch.


Est. Repair Time

1 to 2 hrs

Tools Needed

Screwdriver, Nut Drivers, Saw

Switching to salt water

Written on 7/25/2019 by Guest

1. Mounted control box
2. Hooked up wiring to the control box
3. Installed salt cell
4. Connected salt cell to control box and turned on

Were these instructions helpful? 


Est. Repair Time

Less than 1 hr

Tools Needed

Screwdriver, Nut Drivers

2     0

The old system was no longer working.

Written on 7/6/2019 by Guest

The old system burned out. So all I had to do was replace it with this new one.

I turned off the power @ the beaker box.

Disconnected the power & ground wires unplugged the cell and the flow sensor.

Unscrewed the old system and replaced it with the new system.

I plugged in the cell and flow switch then screwed the power and ground wires back in. Turned the breaker on. I found it to be really easy to do by myself.

Were these instructions helpful? 


Review Summary

 (Average 4.8  out of 5 stars)
5 Rating
5 star:
4 star:
3 star:
2 star:
1 star:

The Most Helpful Review

The Most Recent Reviews