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i use tst sewer treatment. it is orange in a bottle and i get it at walmart. after black tank dumped i throw a little in. never really measure it out. then chase with as gallon water. this sits in tank and sloshes around as i drive to keep things odor free and breakdown residual toilet paper etc. been doin it like this 4 yrs. and never seems to have any black tank issues.
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 2011 Passport 280BH Grand Touring Edition
2008 Chevy Silverado Crew Cab 5.3L, 3.73 Gears, Z85 Suspension upgrade and Timbren SES Springs
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