Watermom, ph dropped after I added the cya was holding at 7.2.How big a box of Borax? I've seen the larger boxes not sure the size.Got into the pool tonight and vacuumed out 2 large loads of gunk, dead algea, pine needles.I filled 2 cartridge filters and clogged the whole hose 2x's. Had to give up after an hour as I only had 3 cartridges on hand and washed 2 out and put the clean one in to filter for the night. Chlorine was holding at the 5-10 on my kit after I added a second 182 oz jug this morning.Put another 182 in for the night.With 364 oz today I should get back up to shock level in a bit. Gonna need a bigger vacuum lol