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I use Scotts and still use chemicals. I don't leave my grey or galley valves open. I put chemicals in the grey/galley tanks also. I don't dump until all tanks are completely full. I haven't had any problems and nothing sits at the bottom of tank, and when i dump the force of all the waste and water should pretty much force mostly everything out. I've done this since living in my unit since april 2006. No problems at all. I put valve lubricant in the tanks every so often also.
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