Thetford Chemicals

What does Thetford Aqua-Kem do for an RV black water tank?

Aqua-Kem breaks down solid waste and toilet paper inside the black tank, controls odor, and helps keep the tank sensors and dump valve working cleanly. It is Thetford's original holding tank treatment and remains the most common choice for RV toilets, cassette toilets, and portable units. Dose per the bottle: typically 4 oz per 40-gallon tank with fresh water added after each dump.

Which Thetford toilet chemical should I use for a cassette toilet?

For cassette toilets, Thetford makes a dedicated Cassette Tank Cleaner along with Aqua-Kem and Aqua-Kem Sachets sized for smaller cassette volumes. Choose by tank size and how you prefer to dose: liquid for precise measuring, sachets for pre-portioned drop-ins, and powder for compact storage. All three control odor and break down waste in the cassette holding tank.

Are Thetford toilet chemicals safe for septic systems and dump stations?

Yes. The current Thetford RV toilet chemical lineup, including Aqua-Kem, Aqua-Kem Bio, and Tissue Digest, is biodegradable and formaldehyde-free, so it is accepted at standard dump stations and is compatible with municipal and most septic systems. Always confirm the specific product label before use if you are dumping into a private septic tank.

What other Thetford parts and RV maintenance items pair with these chemicals?

Most owners restocking holding tank treatment also pick up toilet seals, bowl cleaner, and seasonal maintenance items at the same time. For winter layup, see our RV Winterizing Kits to flush and protect the tanks and plumbing before storage. For tank monitor wiring, sensors, and 12V accessories, check our RV Electronics collection.

How much Thetford chemical do I need per tank dump?

A standard dose is 4 oz of Aqua-Kem liquid (or one sachet) per 40 gallons of black tank capacity, added with about a gallon of fresh water after each dump. Larger tanks, hot weather, and longer holding times call for a full dose; shorter trips and cooler temperatures can use a partial dose. Always start with clean water in the tank so the chemical can circulate.

Do you ship Thetford holding tank chemicals, and what is shipping cost?

Yes, we ship Thetford holding tank chemicals to the lower 48 via standard ground. Enjoy free shipping on orders over $100. Liquid chemicals ship as standard ground freight, no hazmat surcharge. If you need help confirming the right product for your tank size or toilet model, text or call our team at 817-984-1852.