This is our first season with a pool (20,000 gal vinyl liner, sand filter) so we are in the learning process. A friend told me to purchase the TF100 test kit which I did and she's been helping me with the BBB process. However, still struggling with continued low ph and continued high TA. Been adding Borax and muratic acid but maybe not adding enough or correctly.
On 7/17 ph 7.2 TA 210 CYA 35. After adding both each day, here's the latest:
7/20 evening (ph lower than 6.8, TA 160) added 5 boxes of borax
7/21 a.m. ph 7.5 TA 190, added 1 gal mur acid, 2 hours later splashed in pool for several hours to aerate, tested water after swimming ph 7.2 TA 175, then added 4 1/2 boxes of borax after a couple hours tested at ph 7.8 TA 190, waited an hour, added 1 gal mur acid, waited 1/2 hour added 1 more gal mur acid.
Tested 7/22 a.m. ph 7.2 TA 160. So TA is down from the 17th but how many more weeks do I have to go through this process or am I not adding enough at one time? I read in a post to add the borax and immediately add the acid and brush the pool. Is that what I need to do too? Please help! Thank you.