I'm new to this forum, sorry if this has been asked before.
We changed to salt water this past May and have had problem maintaining FC. Had the pool company come out and check the SWG, they said it was producing and issue was our chemistry. I told them I use a Taylor test kit and everything is within recommended levels (also had water checked at pinch penny and leslies pools).
Phosphates less than 100
Water temp 84 (we live in Florida)
Pool tech then said we have algae problem even though water was clear. We did have the beginning of black algae. Since the pool surface was 14yrs old and we really did not like it, we decided to resurface with pebble sheen. All traces of black algae were removed prior to resurfacing. Per Pebble TEC instructions, pool cured for 30 days without salt, using just chlorine. There was no problem keep FC during that period. After the 30 days, we converted back to salt and within days the FC disappeared. We tried running pump 7/24 at 90% (Goldine Turbo T15 cell), still no FC. I took the cell to Pinch a penny to have it tested, result said replace the cell. Called pool company again, they replaced the cell and left. Next day, still no FC. I checked chlorine level at each return jet, shows about 1.5ppm. I also loosened the output connection on the Turbo cell and tested the water, it showed about the same. We ran the pump 9am - 9pm and Midnight to 6am each day, still no FC. Don't know where to go from here.