I'll start by saying I was lazy during the winter and didn't keep up with the pool, so a lot needed to be done for swim season. I have a 20K gallon salt pool (this is our 12th year, I think) that I am unable to get a Cl reading when testing. Things I've identified/tried/etc:
- Cleaned the filter (DE)
- CYA was almost non-existent. I added stabilizer until my CYA now steadily reads about 40ppm.
- Cleaned salt cell. While it wasn't terrible, I went ahead and cleaned the cell (3/4 water, 1/4 acid).
- Ensured salt reading is at 3500
- I have the Pentair IntelliChlor, so ran it in diagnostic mode. It showed no errors and that it is only 20% used.
- Keeping Ph in check (hard to do here; we naturally run very high)
- Typically, my IntelliChlor is set to about 40% chlorination. I bumped it to 60% with no change.
- I placed a couple of Cl tabs in the skimmer to help narrow down if it is a water problem or equipment problem. No noticeable change in 48 hours.
- Today I pushed the chlorinator up to 100%, just to see if there is any change, but I'm not anticipating one.
- Ph = 7.4
- Alk = 60
- CYA = 40
- Cl = effectively 0
- Salinity = 3500
- Calcium hardness = 325
- Saturation Index = -.15