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Thanks Chem Geek. I see now I made a critical typo... I had meant to say that my pH was *rising* faster than it used to, not dropping. But I think you answered my questions anyway. So the pH rise is due mainly to carbon dioxide out-gassing from the higher-than-suggested TA, rather than my...

Okay, different topic but I will keep it with my original post. I have recently been noticing that my pH has been dropping faster now than when I first switched from pucks to bleach (4 or 5 months ago), but I can't figure out why. I'm trying to minimize chemical usage(cost) so wondering if I...

E-Konomy Pool in Tucson has 4-gallon cases of Hasa liquid chlorine, 12.5%, for $3.49 per gallon. 3.49/128/.125= $0.218/oz. However there is a $6 deposit for the case and jugs.

An update... I tried rubbing the black algae spots/specs with the tablet and it worked reasonably well. It's almost gone but it'll need a little more work, on closer inspection there were more spots than I thought(or it spread) and with all the pitting in my plaster they have lots of places to...

Ok, thanks for the quick response. I will probably try the trichlor tablet first... The black spots are scattered but there's not too many of them so I think it's manageable. I ran out of the R0870 powder this last weekend so won't be able to do the OCLT/SLAM until the coming weekend. I'll...

Hello all. I'm a recent convert to the BBB method, having lost far too much money to the pool store. Water was finally replaced in March due to very high CYA. I think I have my water reasonably well balanced now but I think I have some black algae left over from before the refill. It's...