pH keeps creeping up

[Jakebear]

I'm having the same problem (pH Creep). DH says it is normal since we add bleach automatically (pump) but I read one of Richards Posts about the chemistry where he showed that the chlorine reactions caused negligible change in pH (I think the thread was titled "Rising pH levels"). Anyway I've been adding about 15-20 oz per day to keep it in range.

Here's my numbers:

Water temp 85 F
FC 3.0
CC 0.0
TA 100
pH 7.6 (added 11 oz Muriatic yesterday)
CYA 22
CH 140 (but who cares with a vinyl liner)

Bleach Pump add about 20 oz 3% [EDIT: not 6% as originally stated] bleach per hour while circulator pump runs (8 hrs/day)

crystal clear, no algae, no problems, just have to dump acid every day

I'd like a better explanation if there is one.