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Enzymes are not needed and a waste of money. The holding tanks are just like buckets were you hold the waste water until you dump it out. I do put some holding tank chemicals in the black tank to control odor if I'm staying in one place for a while. Otherwise just water and every once in a while a little dishwasher soap to slosh around while traveling.
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2018 Keystone Cougar 22RBS
2020 Ford F-350 XLT SC SRW 6.7l Powerstroke.
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