FPM gave you the one-line summary; if you're ready for it, let me try to unpack the situation in more detail.
If you haven't already read it, chem geek's main story is in this post. In summary, Richard had bacteria convert 20-30ppm CYA to ammonia, and it cost him around 60ppm FC to clear it up. (Many gallons of 10% and 12.5% liquid chlorine.)
The problem is we don't know what your CYA was before this all started, so we don't know how much ammonia we're talking about. You are at around CYA 40 now, IIRC, but you were using the tabs and normally that leads to very high CYA concentrations. If we guess you were at CYA 100 before, then you need to contend with the ammonia produced by converting 60ppm CYA, and you are about 1/2 to 2/3 of the way done. If your CYA was higher than that previously, then you still have farther to go.
I know I would find that incredibly depressing! But, it's the best explanation we can come up with for the situation you are reporting to us.
I think you never got an ammonia test, is that right? If there's a pet store around that carries fish, it likely has an ammonia test. If there is still ammonia in the pool, you still have a ways to go on the bleach.
In these quantities it is really obviously worthwhile to shop around, see if pool stores or hardware stores carry liquid chlorine for cheaper than your bleach supplier. You figure the per-ounce-pure-hypochlorite price as
jug price / ( jug size x percentage )
so 6% bleach, 182oz@$2.94 is 2.94 / ( 182 x .06 ) = .269/oz
and 12% LC, 128oz@$4.40 is 4.40 / ( 128 x .12 ) = .275/oz
For these example prices it's pretty close and I'd go for the 12% just to have fewer jugs to carry around. That part is up to you.
--paulr
If you haven't already read it, chem geek's main story is in this post. In summary, Richard had bacteria convert 20-30ppm CYA to ammonia, and it cost him around 60ppm FC to clear it up. (Many gallons of 10% and 12.5% liquid chlorine.)
1 gallon 6% bleach in an 18500 gallon pool is worth about 3.25ppm FC, so 3288oz or ballbark 25 gallons is worth about 80ppm FC, give or take. That would consume the ammonia produced from the conversion of CYA somewhere in the 30-40ppm range.b/o 402 said:That's a total of 18 jugs (3288 oz) of 6% bleach in one day.
The problem is we don't know what your CYA was before this all started, so we don't know how much ammonia we're talking about. You are at around CYA 40 now, IIRC, but you were using the tabs and normally that leads to very high CYA concentrations. If we guess you were at CYA 100 before, then you need to contend with the ammonia produced by converting 60ppm CYA, and you are about 1/2 to 2/3 of the way done. If your CYA was higher than that previously, then you still have farther to go.
I know I would find that incredibly depressing! But, it's the best explanation we can come up with for the situation you are reporting to us.
I think you never got an ammonia test, is that right? If there's a pet store around that carries fish, it likely has an ammonia test. If there is still ammonia in the pool, you still have a ways to go on the bleach.
In these quantities it is really obviously worthwhile to shop around, see if pool stores or hardware stores carry liquid chlorine for cheaper than your bleach supplier. You figure the per-ounce-pure-hypochlorite price as
jug price / ( jug size x percentage )
so 6% bleach, 182oz@$2.94 is 2.94 / ( 182 x .06 ) = .269/oz
and 12% LC, 128oz@$4.40 is 4.40 / ( 128 x .12 ) = .275/oz
For these example prices it's pretty close and I'd go for the 12% just to have fewer jugs to carry around. That part is up to you.
--paulr