Great info, and thanks for the prompt response. My feeder is after the filter in the return line. Anxious to learn your method. I have no heater or swcg. I had planned on the Sam's Trichlor, very reasonably priced. Also, which strength Cal Hypo is best to use? I have seen a few different strengths.

I am on the fence about whether I should continue a maintenance dose of polyquat weekly or not? thoughts? (fyi, I am not terribly worried about the expense of it)