I'm usually a lurker, not much of a poster... but have you considered trying store brand ultra 6% bleach? I've heard quite a bit of discussion about the high % liquid bleach at the pool store breaking down quickly and not being even close to the 10% shown on the label. I made the mistake once last year of buying some bleach from a not-so-great dollar store. You could tell that the bottles had been around for a long time and I'm sure were old. It was like pouring water in the pool. Didn't do a thing.
Anyway, HTH and good luck with the conversion. Don't give up!
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