I added this to a condensate pan at home in Florida last spring and the condensate line didn't clog for the next 6 months while I was up north (it clogged last summer while he was away ). After 6 months, a small yellow substance remained from the tablet in the drip tray. However, I also had someone pour a cup of bleach down the line every month, and maybe that was more important. The combination of these two things worked last summer
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