Got my alk down to 115, then had to add 3" of water. Lowered PH to 7, and had kids over again yesterday (not near as many). Today PH was 7.6 and alk was only 130. Dropped PH to 7 again, more kids coming swimming this afternoon, will retest alk and PH tonight.

I should end up with a full pool and a 110-20 alk, which should hold me for awhile.