From what i've experienced in the past few years, this isn't always true. Two summers ago, I was on bleach. I kept slugging it in there, but had to add poly to keep the mustard down. I figured this was from the "yo-yo" bleach levels I was getting. Last summer, I installed a SWC. I was able to easily keep my Cl at a constant 5+. I still had mustard. CYA was at 40 or so. I kept having to brush the pool every week. I slopped a quart of poly in there and *poof* the mustard went away for the rest of the season.Originally Posted by Watermom
Yeah, surprised me too. I figured the high Cl would take care of bidnezz, but it didn't. I think once your water temps get high, even Cl won't hold it down.
Michael
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