My TA may have been a little low all summer while my PH kept going from 7.4/7.6 to 7.8 within a week (using 2 gal of 12.5% liquid). I kept bringing it down with aquachem "PH down". TF kits had my TA at a 100 while Leslie's and others had it as low as 60. Today my TF reading is around 50-60 (50 when it turns red, but it turns even more red at 60 and then the color stops changing), while leslie's reading 60-70. go figure.
I'll be closing pool within a week or two and wonder if I need to adjust TA before then. I have 4lb of AquaChem "TA Increaser", which according to aquachem should not upset PH or should not upset as much as soda ash would. I know I may need a little more than 4lb, but do I really have to adjust it now?
my current readings:
CH ? (with tf kit over 500 now, used to be over 600, with 5-6 different pool stores 350-500).
P.S. I've been using aquachem dual layer tabs for the last couple of weeks. Not sure if it had affect on TA, but it kept my PH at 7.6.