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We use a scoop of generic Boraxo and a scoop of the cheapest laundry powder after each dump- Powdered products are easier and safer to transport than liquids which make a mess when spilled [don't ask how we know]- This system has been in use by rvers for at least as long as we have been fulltiming [13 years and counting]- Coupled with use of the power flush, this may be why our tank sensors still work somewhat- JMHO- Don
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