Most often I use only water but if hot in the summer and several days between dumps I'll add some type of deodorizer - I'm not particular about the brand but do use septic safe products.
Bob
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Bob & Sandi, dogs Tasha a Frenchie and Tiki a Skipperkey
SW OREGON 2005 34 foot DolphinLX
If towing: a bright red 2016 Mini Cooper on a tow dolly.
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