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I've even read on some bottles of chems "never add directly to filter compartment" and then on the tub owners manual it states, "add all chemicals to the filter compartment". Talk about contradiction.-Sarge
Yes, the chemicals will mix more quickly if put in the filter compartment when it's running - that's a no brainer, ...
I just fired up all the pumps, and it may just be the layout of my tub, but the water in the tub was considerably more turbulent the in the filter box.