sorry if this is a repeat topic
i cant keep Chlorine , i have a Salt system. ph 7.4 cya 77, Zero Chlorine, mineral level 2500 pool store, 2900 unit and 3300 test strip, my pool is crystal clear i have a 17000 gal.vinyl pool and an over sized pump 3hp, 8 returns ( i have a reversal valve to skim off the warmer top water through the returns while i am heating it, (rarely do i reverse it) I can turn the pool over in about 5 hours.. I figure it pumps about 80-100gpm
Anyway since i installed this pool 3 seasons ago i dont think i EVER had chlorine out of the Salt system or the amounts are being eaten away... I can now hold chlorine for a few ( 3 or 4) days if i throw some in but thats about it since I finally saw in a forum about Phosphates and that seemed to help ( they are now zero) If i add chlorine at night the next day its already dwindling.
My pool was very green at opening this year(mesh cover) ( So Central Pa ) and had an small algae plume. twice early on when after i back washed the sand filter, a white cloud came out of all returns but the cloudiness dissipated in 20 minutes or so. To get rid of the phosphates i used Phos Floc and phos free. Phosphates are now 0
did an ammonia test, that was clear as well