Pool PH Always High

Since I had my pool liner replaced, over 1 year ago, the PH is always elevated when I check (not too often recently). The pool repair company said that PH woudl be high after the new liner and I should add acid to control. I did that for 3-4 months religiously and situation has stayed the same. Wouldn't the liner have stabilized by now? It always requires 3-drops of neutralizer to return to acceptable PH, no matter how infrequently I check the PH. Is it possible my PH is OK, and my chemicals are too old? I checked PH today and it was 8.3, and again 3-drops of neutralizer returned to acceptable. I added 1-gallon of acid to the 15k-20K gallon pool.

I keep chlorine on high side w/ 3" tablets in a floater basket that gets continuously bathed by spa outflow. I closed the basket ports today to reduce chlorine which was higher than usual, at upper end of visual "yellow" scale.

I have never heard anyone say that a new liner would cause ph to be elevated. That's a new one. I replaced my liner this summer and didn't find that to be the case. How old is your test kit?

It's old, but the chemicals are probably 3-5 yrs old. The tests seem to work fine but the results are puzzling. I will get some new chemicals and try them. I'm almost out of the 5-drop parts anyway.

regards

If your chemicals are that old, I wouldn't trust the results. I agree. Get some new ones and try again.