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Interesting that the black tank sustained this type of damage ... The back pressure trying to come back down the sewer line from tank should have been able to easily overpower the incoming water pressure from the hose.
I use the Valtera flush ... same as the Camco/Rhino and have for many years. But I don’t leave the gate valve closed for more than 2 minutes during each backfill to wash gray or black tanks.
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