I get the beads at Walmart for a couple of dollars a box....they call them beads, but they look like colored sugar. Dissolve about a fourth of a cup in hot water, and put them in the toilet after dumping....flush the toilet.
This stuff is really slick (literally). The box says use 1/2 cup for a bath tub. A normal tub is about 80 gallons, my black tank is 40 gallons, thus my reasoning for using 1/4 cup.
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