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when on the road every day as the sloshing around travelling gives the tank a good cleaning. When stationary for a long time every 3 days or so. we also keep the galley tank closed as that tank can get as nasty as the black tank. We normally keep the gray tank open but will close it a day before we dump to collect shower water to flush out the hose. Right now the camper is on the pad along side the house with black,grey and gally tanks 3/4 full and with a good dose of Rid X. They will stay that way for about one month while the Rid X works and when we dump those tanks will be super clean. Been doing that for years.
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