I've been a salt water pool owner for over two years and I'm recently having difficulty with the cloudiness of my pool. The pool is 21,100 gallons, and I have a Hayward DE Filter. Just installed a new Hayward variable pump at the beginning of last year. The SWG is turned on to 76%.
I opened the pool on Saturday, (June 6th) and as usual, the water was dark green with lots of dirt on the bottom. I balanced the required chemicals and added Power Plus shock (two bags) to the pool. As the week went on it became clearer (80% blue) and completely visible with the exception of the remaining dirt at the bottom of the pool. My Alkalinity, Calcium, CYA, Salt and PH levels were all well within recommended range (although PH was 7.8), but for the first time in three years, I registered 0 FAC. I found that odd as I've always had some traces (1-1.5) FAC in the pool.
On Wednesday (June 10), when I came home from work, the entire deep end of the pool was murky and the shallow end was partially cloudy. I brought a water sample to Leslie's and the manager said I didn't need FAC in my pool since it's salt water. The other gentleman working seemed puzzled at the manager's response, as he initially suggested adding shock to the pool to raise it. The manager suggested adding Ultra Bright to improve the clarity of the pool. I went home and backwashed, since the PSI was 8 over the normal level and added the Ultra Bright. I let the filter run over night and checked it out the next morning. The water is still incredibly cloudy, the FAC is still 0 and the PSI went up another 6-8. I backwashed the filter again, replaced the DE and added a second dosage of Ultra Bright.
My question is this: Is the reason why my pool is so cloudy/murky because I haven't given it enough time to clear up on its own, as the drain at the bottom o the pool is still filtering out all the remaining dirt, or is it because I have 0 FAC in my pool? I've only had the pool open five days.