Not sure if this is the right forum, but my bottom line question is "what else can I test" so I'm posting here.
I have a 23,500 gal vinyl pool with a high CYA - 136 (high, I know) and a new SWG. I would rather not dilute if I can - it will happen naturally with all the rain we get in the summer and I just spent a ton on salt.
I can't seem to keep my chlorine up even though the pool is clear. My test at the pool shop yesterday showed (they use these little square vials in the computer):
TDS 0 (I assume due to the salt)
Copper . 03
Per their recommendation, I did 7 gal of 12% bleach last night to no avail - 1 at 6p (0FC), 3 at 7p (0FC), 3 at 8p (no test - ran out of strips!). I bought more strips today and had 0FC at noon. SWG was on superchlor all this time and you could see the gas entering the pool. Foam did form on top of the pool (as it did last week when I did 3lbs of HTH Shock-it cal-hypo - 0FC 4 hours after). The foam was gone this morning and the pool is a clear as I have seen it.
I bought a cheapo OTO test kit in case my AquaCheck strip was bleached out - no reading there either. I bought an FC/TC strip at the pet store- no reading there and no bleaching - one was white and one was yellowish - both zero. I bought an ammonia test at the pet store - never moved off the initial 0 yellow color.
Any suggestions on figuring out how much I need to get my chlorine up? Is there another test I can run?
Is the amount cumulative (that is, will I get credit for the 7 gallons, or do I have to start over?). Should I just buy30 gallons of 6% and put a couple or three in every half hour? My wife is hating all the time I am spending on the pool and I am pulling my hair out.
Thanks for any input.