Q: Hi: I have a Waterway in-line Chlornator. Installed July 2007, white, gray lid, gray control knob on top of return line(not the older type). Pool is in central Florida, 7,500 gal, 1 1/2 hp pump,no screen. The first weeks the chlorine level stayed up/too high. I adjusted it down, also cut hours on pump to 5. I can't get the chlorine back up. Am adding by hand every other day/summer, 3rd/4th day now that its cooler. Any chance it is a defective unit? Suggestions?(can't afford to go salt) My warranty is expired, should have checked into this sooner. Thanks.
A: I would have a few questions for you regarding the diagnosis. Think about these and things should become clearer.
Do the tablets dissolve? At the end of the day all the chlorinator really does is run the water over tablets. If the tablets are dissolving at a reasonable rate, then the problem is most likely elsewhere.
Where do you get your tablets? We find that many of the tablets sold through large retailers (Wal Mart, Costco, etc.) do not have a lot of active chlorine.
What is your cyanuric acid level? Cyanuric acid and chlorine level are intertwined and it is a good thing to know.
How are you testing it? Sometimes the test can be fooled by high levels.
If all the above seems normal and all the other pool readings are normal we would run a test for phosphates. A high phosphate level will "eat" chlorine quite effectively.
We have a more detailed discussion of some of these issues in our chemistry section. Check the link below:
Let me know what you find.