Thetford's best-selling concentrated liquid holding tank treatment for RV and portable toilets. Breaks down waste, controls odors, and prevents gas build-up. Fresh scent. No formaldehyde. 8 oz bottles, 6-pack. Previously known as Thetford part number 96901.
The Thetford 50437 is a 6-pack of Aqua-Kem Blue Concentrated holding tank treatment — Thetford's flagship liquid holding tank chemical for RV black water tanks and portable toilets. Previously known as Thetford part number 96901, this is the same trusted formula under an updated part number.
Aqua-Kem Blue Concentrated works on three fronts: breaking down solid waste and toilet paper to prevent clogging and tank buildup, controlling odors from waste decomposition and gas buildup, and leaving a fresh scent in the tank between dumpings. The concentrated formula is formaldehyde-free, making it campground, marina, and septic-system safe. Each 8 oz bottle treats one holding tank cycle.
• 6x 8 oz Aqua-Kem Blue Concentrated bottles How to use: Pour one 8 oz bottle into the RV toilet or holding tank after each dump and flush with 1–2 gallons of water. Add more water to the tank before use. Treat after every emptying for continuous odor control and waste breakdown. Also available in larger sizes: • 96904 — Aqua-Kem, 1-quart bottle • 96903 — Aqua-Kem, 1-gallon jug
Aqua-Kem (liquid): • 50437 / 96901 — 8 oz, 6-pack (this item) • 96904 — 1 quart • 96903 — 1 gallon Aqua-Kem Toss-Ins (dissolvable pouches): • 96629 — Aqua-Kem Toss-In tablets, no measuring needed Aqua-Kem Green (biodegradable/enzyme): • 96526 — 1 quart Choose liquid Aqua-Kem for bulk value and flexible dosing. Choose Toss-Ins for convenience — pre-measured, drop-in pouches with no pouring.