what makes the ph go up?

[Bergerman]

Hey all, This year my ph keeps going up. This is our 4 season and we have never had this problem before. What could be the cause?

Water #s
PH7.8+
Alk 110
cal 180
cya 30-40
tc 4.0
cc 0
fc4.0
we have a steel/vnl inground/heat pump
26,000
Thanks,
Ed

[cleancloths]

Were you using pucks in the past and bleach this year? That will do it. Pucks drop your pH while bleach raises it. That is why I use half pucks and half bleach, then I never have to mess with my pH by added separate chemicals. When it is low I use bleach, when it is high I use pucks. I don't worry about CYA going up as water naturally gets lost due to backwashing or on weeks like this where I got 7" of rain and had to pump out that much water.

[aylad]

pH rise can be caused by many things, among them use of bleach or cal-hypo, aeration of your water, curing plaster, or sometimes your pool will just find its "normal" level and want to stay there.

Janet

[Bergerman]

Thanks for all the help. My Ph is down to 7.3-7.4 and holding steady . My alk is at 80-90 or so after a ton of rain.

Cheers,
Ed