I haven't really looked at our new 220 pot, but same in our race trailer - opt sits directly over the black tank. I replaced the potty in the race trailer year before last because I didn't get all the water out of the flush valve. Oops. Had a spare pot in a box, so R&R was just quicker/easier. And same - after every use I spray the heck out of the black tank with one of those sprayer/whirligig things. The sensors work fine in that trailer even after 4 years of use. We use an additive, make sure we use septic friendly/easy dissolve paper and rinse-rinse-rinse. Will probably use a combo with the installed wash out on the road side of the RV and the wand.
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