Forgot to add #6. After the final draining of the blk. tank, raise the hose one more time as if to back flush again. This time leave enough grey water in the blk. tank to cover the bottom-prevents the dreaded pyramids (same principle as toilet having standing water-it is some kind of solid-suspension thing
). Close the blk. tank valve while the grey water is back flushing, drop the hose and finish draining the grey tank.
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