This is probably a topic covered repeatedly somewhere herein, just short on time and long on work atm. I have a pool in my care that although by all accounts (ie: TC, CYA, TA, FC, etc. using Taylor 2600) are all on the money for a gunite pool this one picks up an upward swing in PH regularly. Pool is located in SW FL, 12k gal. range, and had a new tile roof installed last summer. I was wondering if anyone has experienced an upward PH drift due to new glazed tile runoff.
It is not an SWG pool, is chlorinated by liquid only (no feeder). It also gets attention at least three times a week due to the PH swing going on right now. I suspected that TA was the culprit - but it has been just about target for this pool @ 90ish. I have tried to lower it to no avail, PH still creeps up. The measured PH on monday is 7.3 w/ a good water balance, CYA running about 50, FC 3.5, TA 95, water temp approx 83F and by Friday I have a PH of almost 8, FC 2.5 with no additional chlorinator/sanitizer added. Will do the same thing w/ TA @ 70. Go figure. A low PH pool w/ a relatively low TA still creeping up in PH and no real chlorine shock going on. Liquid acid used as balancing agent. Chlorine loss in full Florida sun is about right for the time w/ CYA level. No green or mustard problem at this time. New cage super gutters were installed during roofing so roof runoff should be less than prior to new roof. Pentair pump, DE filter working normally with 9hr run time daily. Hence the roof coming into question.
Input/thread links appreciated. Thanks so much for your wisdom and experience - this is a great resource. Almost feel bad I haven't had a problem child since last year.