How will I know when the cell is ready for replacement? Will I simply get an error code on the controller or is their some particular symptom I should be aware of? Can checking the resistance between the two cell contact pins (with water flow of course) with a multimeter give me any useful information about the condition of the cell?
The beginning of July will begin my APURE700's third year. I run the pump eight hours a day during the summer and all levels are about within normal range except I've been having difficulty maintaining the total chlorine and free chlorine at a high enough level. The first two summers I ran the cell at about 75-80% throughout the summer and it maintained the chlorine levels fine. We haven't had any unusual conditions and matter of fact although we're in our rainy season, I've had relatively little rain fall at my home the last several weeks. I've been running the cell at 100% eight hours a day for four days and finally yesterday set it to run a full 24 hours straight at 100%. The chlorine levels are still low, results listed below. The previous two years I've had to add a little acid every week or so when we get rain but its been easy to maintain the pool. Lately I'm struggling with the chlorine and I keep getting light green algae on the pool walls that get more sun.
I've used test strips, a regular test kit, and testing at my local pool store to confirm the results. They're all within the same neighborhood. I've got a DE filter which I disassembled and fully cleaned a couple of months ago just before summer. Pressure at the filter is the same the day the pool first went into service, about 14 psi. The cell had a very small bit of visible mineral deposits when I cleaned the filter so I soaked the cell in 1 part acid and 5 parts water for about twenty minutes to clean it.
Pool use has been pretty light the last few weeks with my nine year old in maybe an hour every other day.
Inground 10,750 gallons
Water temp is around 84Â°F
Salt 3.2 ppm
Total Hardness around 250 ppm
Total Chlorine 1 ppm
Free Chlorine 1 ppm
Total Alkalinity 120 ppm
It just doesn't seem I'm getting the chlorine production I should be although I've got no trouble indicators at the control panel.