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Have a #320 chlorine dispencer installed along with all new equiptment spring 09., worked fine, kept chlorine level right. Now can not get level to only a trace. Dismantled and re-assembled, all looked OK. Removed supply from bottom to top, still low chlorine levels.

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Thank you for posting your question here on Fixya.com.


Have you checked your water for acid levels to ensure you have enough to maintain your chlorine level? Adding stabilizer (cyanuric acid) helps the chlorine remain in the water longer and if you had to replace much of the water since your chlorine levels were OK you need to add more stabilizer to keep the chlorine in the pool. Have you altered the amount of time the pump runs too? An erosion feeder like yours only adds chlorine when the filter system is running. If you have scaled back the amount of time the equipments runs you will also be adding less chlorine over time than you previously had.


If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!


John

Posted on Oct 11, 2010

  • fixzum May 13, 2015

    Chlorine tablets do not dissolve properly if they do not have enough water flowing over them, and this is not necessarily the fault of the chlorinator at all. I tried replacing my all my Pentair 320 chlorinator parts - screen, tube, check valve and control valve - and they were not the problem. It was the pool filter! If your pool filter is dirty, or it stays yellow or brown despite regular cleaning, then it will reduce the water flow into to the chlorinator, even to the point where no water gets to the tablets.

    A strong indication that this is happening is that your pool pump is registering 5 psi or more than its usual operating pressure, because it is trying harder to drive the water through the old filter. Treat yourself to a nice brand new filter. I did, and the pump pressure dropped back to normal and water gushed through the chlorinator. After this you can adjust the flow control valve and the number of tablets inside the dispenser to suit your pool's requirements as per its chlorine and pH test results.

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The chlorine feeder, maybe installed improperly?
Check this...
Turn flow control dial to 0, then remove lid, then turn flow control dial to 5.
Now watch the water fill into the canister. Does it overflow?
If not the pressure is wrong. Or it is plugged. Most commonly at check valve at bottom, and/or the flow control dial.
How long have the tablets been in the feeder?
If there is correct installation, or if all flow is correct, when you remove the lid, you should NOT smell a strong chlorine odor! If there is a strong smell, the water will probably have a yellow tint?
If so, it is either plugged or installed incorrectly.
Do the tablets appear to have melted? Or do they look exactly the same as when they were added? If you do have actual erosion of tablets and you refill frequently, then you need to either add additional tablets maximum up to 10 tabs, or hand feed from another source: Liquid or Granulated. Your chlorine demand is high if that's the case, and you need to meet that demand.

Posted on May 13, 2015

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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".
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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.

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