What is the best & longest brand? Dry camping for 10 days - did the same last year & when we finally were able to empty our tanks, it was very odoriferous!
I use the Geo Method and also RV Digest-It. Any product with formaldehyde should be avoided as it kills the bacteria which in turn results in clogged sensors and gummed up holding tanks.
Agree, flushing with plenty of water is key to reducing odor.
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