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We regularly use chemicals (eco-friendly, enzyme based) for the black tank and occasionally in the grey tank as well...not so much for the odor control, as the p-traps should take care of that, but for cleaning and helping to reduce gunk build-up in the grey tank...yes, it's only grey water, but there can still be gunk build up. We put it down the kitchen, vanity and shower drains to also treat the p-traps...
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