1. noOriginally Posted by derrikm
2. 125 is the highest. 100 is fine. Don't go higher.
3. probably not. Something else is driving your ph up
4. Negative. At best no effect, but go too high and your pool will go milky--I'd bet money by 150ppm you'd have cloudy water and at 200ppm I can practically guarantee it.
Some people occasionally find that bleach drives their pH up--it has pH, I believe, of 11. Also, new concrete pools drive up pH as they cure. Has yours been re-plastered or otherwise treated?
Where is your CYA reading? (stabilizer) If it's very low, then Tri-Chlor pucks or Di-Chlor powder would be ideal instead of bleach. Both are very acid. But if CYA is 50 or higher, it would be a mistake.
Draining your water and refilling would lower your CH to 350--that's a good # for a concrete pool--200-400 is recommended, but 550 is too high. If you use Poconos's plastic sheet method you can do a full water replacement with no risk of the pool floating out of the ground. You said it's not an option but I see no reason not to use it...Again, CH=350 is good for your pool, but 550 is too high and MAY be part of your problem.
There are other approaches and others can chip in with them.
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