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Not all hose washers are created the same. The OEM ones are not exactly high quality in our case just a normal hose washer purchased at Lowes solved the problem of leaks. We rarely use any additive in our black tanks just lots of water and dump/flush often. When we do use something it is generally whatever we can get our hands on. We are partial however to happy camper and RidX for Rv's. When we get home this spring we will fill all tanks with RidX for Rv's and let it work for a week or so then give them a good flush.
We never have problem's with clogged tanks just burst tanks.
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