I would say, do the polyquat, and try to maintain moderate to low chlorine with the tabs. If you NEED to boost chlorine, because levels are getting too low, add small doses of bleach or dichlor.
By the way, in general, it is never safe to add other chemicals over the top of tabs in the skimmer. Borax is the exception. You *can* add borax to the skimmer while tabs are there.
Bookmarks