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Cleaning the inside -Pentair 320 Chlorinator Model R172276

We have a Pentair 320 Chlorinator Model R172276 for our above ground pool (15,200 gallons). It seems like the chlorinator is dirty orange inside and can't seem to get it cleaned. Our chlorine reading for the past week has been ZERO but we have added aobut 10 gallons of chlorine, shock, etc.
How can we clean the inside bottom of this model. We looked everywhere and doesn't seem like it twists off to have access to the bottom. Help

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Their is a set screw in the side of the chlorinator towards the bottom (you should see a little hole in the side of the chlorinator near the base). remove that screw and the chlorinator will unscrew from the base.

Posted on Jan 16, 2010

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Posted on Jan 02, 2017

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I dropped the lid to the pentair 320 chlorinator for inground pools. The rubber gasket fell out and I don't know where it goes nor does it fit inside the lid. Do the gaskets go inside to screw on lid...


Yes, the o-ring does swell up. I am not really sure what causes that, but the only fix is to replace it. It goes inside the cap. Only use teflon or silicone based lube on it.

Jul 23, 2013 | Pool & Spa

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Pentair 320


There is a term out there that is called "chlorine lock". It happens when the cyranuric acid level is excessive. Cyranuric acid (Cya) is also known by the names "conditioner" and "stabilizer".
Although it has not been scientifically verified, many pool pros including myself have run across chlorine lock, although it is very rare. An extensive study was done by Occidental Petroleum back in 1995 that took Cya levels to over 3000 ppm with no unusual effect on pool chemistry. (normal is 30-90 ppm)
However, it cannot be denied that chlorine can remain at high levels for weeks on end during the hottest times of the year with no additional doses.
The 320 chlorinator has been a staple in the industry for decades and has been proven very predictable and reliable.
Have your Cya level checked at a pool supply. If excessive, drain off some water and refill. Chlorine neutralizer is available at any pool supply to alleviate the high chlorine issue very quickly.

Jul 03, 2013 | Pool & Spa

1 Answer

Have a intex 18x48 above ground pool, how much salt to add to it for the first time


If you have an Easy Set pool, should be around 5500 gallons, then the initial salt add should be approximately 135lbs...

If you have an Circular Metal Frame pool, should be around 6400 gallons, then the initial salt add should be approximately 160lbs...

Make sure you only run the pump for 24 hrs to properly dissolve the salt, then you can set your chlorinator to desired time... Start high and work your way down... 10 hrs pump and 8 hrs chlorinate...
Check your chlorine level after the first two days and see if it starts to climb above 3ppm, if it does, lower your cycle time until you can maintain the 3ppm level...Hope this helps you?
Good luck and enjoy your pool!!!

Aug 25, 2011 | Intex Automatic Salt Water System for ...

1 Answer

How much salt do you put in a 22,000gal. pool?


WOW... You have a huge above ground pool! Are you planning to use the Intex chlorinator to chlorinate your 22,000 gallon pool??? If you are, take a look at the max gallon rating and how long you may need to run... Here's a chart that should help you determine how much salt to add... After adding the salt, run the pump for 24 hrs without the chlorinator to properly dissolve the salt... Don't be surprised if you need to add above 500 lbs!!!
Good luck and hope this works for you...

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Aug 22, 2011 | Intex Automatic Salt Water System for ...

1 Answer

Pentair model 320 pool chlorinator...now filling with high volume from the bottom of the unit in addition to the chlorine control valve on the top. The result is lack of chlorine metering; tablets are...


This issue sounds tricky. I recommend you call the Pentair technical support at 800-693-0971and they should be able to help you figure this issue out. I hope this helps.

Please vote on this answer. Thank you.

Aug 15, 2011 | Pool & Spa

1 Answer

How much salt do I add for 15'x 52" above ground


Your pool should be between 5000 and 5500 gallons= between 125 to 135lbs of salt... They come in 40lb bags... Your salt PPM should also be 2500 and 3000.. Test strip reading at 6.2 to 6.6
Add your salt by spreading around the pool and run your pump only for 24 hrs to properly disolve the salt.. Then you can set and start your chlorinator... Good luck and enjoy your pool...

Aug 12, 2011 | Intex Automatic Salt Water System for ...

2 Answers

Ok i have the intex 1600gph sand filter saltwater combo system and my pool hold 8000 gallons i can run the chlorinator 24 hrs a day and it will not get the chlorine and free chlorine above 1 the ph is 7.5...


Yes, what is your stabilizer level? It should be between 30 and 50 ppm. If the stabilizer is too low then the sun will cause the chlorine to dissipate faster than the chlorinator can produce it. Some salt chlorinator manufactures recommend 80ppm but that reduces the chlorine efffect. If you can't get the chlorinator working then using a floating tablet chlorinator is a good option to keep the pool open. I hope this helps.

Aug 12, 2011 | Intex Automatic Salt Water System for ...

1 Answer

How do i take apart my pentair chlorinator to clean the cells?


If you have a pentair intellichlor, you'll need a cleaning kit or a way to cap one end. remove the union nuts at each end, cap one end and fill the cell with diluted muriatic acid. If you're not comfortable handling acid, call a pool service tech. You may have to drain and refill the cell several times to clean all of the scale out.

Aug 25, 2010 | Pentair Pool & Spa

2 Answers

Pentair 320 (inline) clorine not disolving


Three possible solutions, and I have personally made use of all of them with great success.

1. A common reason why the flow of water through the Pentair 320 canister is insufficient to dissolve the chlorine tablets is that the pool filter is dirty or just too old with ingrained sediment. If your pump pressure is continuously running high then this usually indicates a dirty or old filter that is making it difficult for the pump to get an adequate flow of water through the chlorinator. If thoroughly cleaning it makes no difference, treat yourself to a new filter; it's often an immediate fix and the pump pressure drop may amaze you. Old filters that have served their time are deceiving. They may look clean but the fine sediment trapped in their fibers can seriously degrade performance downstream in the chlorinator.

2. Another trick to help SEE what is going on is to replace the short black feeder hose to the Pentair 320 canister with PVC tube, 5/8" outside diameter, 1/2" inside diameter, and a short piece of Pyrex tubing inserted into the middle of the PVC tube to serve as a clear sight glass. PVC tube is rated 100 psi and is readily available at just 50 cents a foot at local hardware stores. Pyrex tube with an outside diameter of 1/2 inch (13 mm) can be bought cut to length for about a dollar per inch from EBay sellers. I also strongly recommend swapping this new feed tube assembly to the UPPER inlet of the chlorinator and moving the plug from there down to the lower inlet. See the attached photo.
You will need an 8 inch and 3 inch length of PVC tube, and a 4 inch length of Pyrex tube. Insert the ends of the Pyrex tube 1/2 inch into each piece of PVC tube with some Goop glue smeared all around the outside of the Pyrex ends. Do not get any Goop inside the Pyrex tube, and do this as quickly as possible, rotating the Pyrex as you insert it into the PVC to ensure that the Goop forms a complete seal. Then let it set, preferably for 24 hours.
Now you have a new feed tube 14 inches long in total, 3 inches of which is the Pyrex sight glass. Just take the unions and spring off the original black hose and transfer them to the new PVC tube, putting the spring on the 8 inch piece of PVC tube. The 3 inch piece of PVC tube should be at the top of the feed where it enters the Pentair control valve.
You will now be able to observe the rate of flow of bubbles in the Pyrex tube (transparent PVC tube soon becomes opaque because of the chlorine but Pyrex remains clear) and know if water is proceeding up the tube and then cascading down over the chlorine tablets. Adjust the Pentair control valve to check if the bubbles speed up and slow down.

3. Lastly, when you open the Pentair 320 to insert new chlorine tablets, the water will normally drain down and out of the canister. IMPORTANT - When you restart the pool pump, keep the cap OFF the canister but have it ready. Assuming you have the Pentair control valve set above 0 (zero) flow, you should soon see water starting to flow through your new PVC feeder tube and then entering and rising up in the canister. When it gets past the top of the chlorine tablets screw the cap on until it feels firm but not cranked hard. If it leaks a little, tighten until that stops. Now you have got rid of that potential air trap that can prevent water rising to completely cover the tablets. Do this EVERY TIME you add new tablets to the canister.80edc77f-aab6-45be-854b-dcd213e89f9c.jpg

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