pH wil not go down

passionsrlz

Well-known member
Jun 4, 2010
241
Dayton, Ohio
My pH is at about 8.3 and I can't get it to lower. I have put in a whole bottle of pH down and have started using the muratic acid. It won't budge. I am stumped. Any ideas?
 

passionsrlz

Well-known member
Jun 4, 2010
241
Dayton, Ohio
I will keep adding it I just wanted to make sure I was doing the right thing. I did a complete refill this year and have never had so many issues with my pH level.
 

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,880
Silver Spring, MD
With very high TA level it can take a dramatic amount of acid to lower the PH. If you have borates in the water it can take even more acid to shift the PH.

One special case to watch out for, if the FC level is very high (roughly 18+), the PH test will not work correctly and will report false results.

The other fairly unlikely possibility is that your PH reagent has gone bad. It might be good to do a double check on say your tap water and make sure the PH test is working.
 

Richard320

TFP Expert
LifeTime Supporter
Jan 6, 2010
22,069
San Dimas, CA (LA County)
I inherited a pool service when I moved in this house. After a couple months, I bought a 3 in 1 test kit. pH was maxed. I wasn't sure if it was plaster or painted, the pool store sold me dry acid. I put the whole 10 pounds in (not all at once) and pH didn't budge. By then I determined it was unpainted, so I bought Muriatic Acid. It took a whole gallon to finally nudge the pH into the center of the test block.

So your experience is not unique at all.