Hi, all!
I have done SLAMs before, but this one seems to be slower than usual.
I was gone for a bit and pool-care arrangements did not work out so well (let's say), so coming back there was a fair amount of algae growth on the walls, but water was still clear. I measured the chlorine with the powder+drip test kit and got to VERY little (like 1 ppm; the test water barely changed color with the powder).
So I tested CYA (at 45) and pH and then went to SLAMming, using 10% "chlorinating liquid" (sodium hypochlorite, from Home Depot). I am only adding chlorine twice per day, but each time I am down to 7-10 ppm (from 20 which is my recommended SLAM level) within a half day. This has been going for 5 days now, although the last two days I was down to only 12-13 after a half day. Water looks nice, and walls a clearing up nicely (doing hand brushing, running my robot 5-6 times a day, and washing cartridge filter regularly, like every day or lately every other day). I never really had any big amounts of combined chlorine (max 1ppm).
For a 12000 gal pool, I have used about 10 gal of 10% bleach thus far.
Am I doing something wrong? I have done 1-2 slams on the same pool in the past, and they haven't taken this long or this much chlorine.
Thanks!
P.S.: I am in South Florida and it's been nothing but sunny, so I'm sure daytime sunlight burnoff is fairly high. But the overnight draw-down has been substantial, too and is only decreasing slowly.
I have done SLAMs before, but this one seems to be slower than usual.
I was gone for a bit and pool-care arrangements did not work out so well (let's say), so coming back there was a fair amount of algae growth on the walls, but water was still clear. I measured the chlorine with the powder+drip test kit and got to VERY little (like 1 ppm; the test water barely changed color with the powder).
So I tested CYA (at 45) and pH and then went to SLAMming, using 10% "chlorinating liquid" (sodium hypochlorite, from Home Depot). I am only adding chlorine twice per day, but each time I am down to 7-10 ppm (from 20 which is my recommended SLAM level) within a half day. This has been going for 5 days now, although the last two days I was down to only 12-13 after a half day. Water looks nice, and walls a clearing up nicely (doing hand brushing, running my robot 5-6 times a day, and washing cartridge filter regularly, like every day or lately every other day). I never really had any big amounts of combined chlorine (max 1ppm).
For a 12000 gal pool, I have used about 10 gal of 10% bleach thus far.
Am I doing something wrong? I have done 1-2 slams on the same pool in the past, and they haven't taken this long or this much chlorine.
Thanks!
P.S.: I am in South Florida and it's been nothing but sunny, so I'm sure daytime sunlight burnoff is fairly high. But the overnight draw-down has been substantial, too and is only decreasing slowly.