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- DiploStratExplorerFree advice is worth what you pay for it, but many folks swear by Happy Campers. We do not have a black tank, but have gotten good results in our grey tank.
YMMV, of course. ;)
https://www.happycampers.store/ - Walmart said "out of stock" everywhere I looked.
Thetford site does not list Campa Chem, now lists "Thetford’s new family of Campa-Fresh® holding tank treatments "
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