Quote Originally Posted by Watermom
If you are diligent at testing your water and keeping your chlorine at the appropriate levels, then you don't really ever need polyquat.
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.

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