Safe for cassette toilets?

Hello, This is an enzyme-based holding tank treatment, which means it's safe to use in any type of holding tank (RV, Marine, truck) and in septic systems. Thank you

Can it be used in gray and black tanks the same way?

We really don't know about the use/purpose in the Gray tank, definitely in the black tank. Why not just something like Dawn dish detergent in the Gray tank? Just a thought, it's a good degreaser.

This product uses 8oz single use bottles and another company has 4oz single use bottles. Which do you need?

My tank is 50+ gallons. I tried the 4oz version with poor results. Switched to the 8oz bottle and it works just fine.

Thetford 96689 Aquamax Summer Cypress 6 8 Oz

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

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€ 99.75

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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Description

🌿 Keep your RV fresh & clog-free—because your adventure deserves the best!

SAFE FOR ALL SYSTEMS - Tested and proven safe for RV, marine toilets, holding tanks, and septic systems.
BULK 6 PACK CONVENIENCE - Six 8oz bottles to keep your tank fresh all season long.
FRESH SPRING CYPRESS SCENT - Eliminates unpleasant odors with a clean, natural fragrance.
POWERFUL TRIPLE ENZYME ACTION - Breaks down waste & tissue fast to prevent clogs and residue buildup.
CAMPGROUND CALIFORNIA COMPLIANT - Formaldehyde and bronopol free for eco-conscious travelers.

Thetford 96689 AquaMax Summer Cypress is a powerful, triple enzyme holding tank treatment designed to rapidly break down waste and tissue, preventing clogs and residue. Its fresh spring scent neutralizes odors while being formaldehyde and bronopol free, making it safe for all RV, marine, and septic systems. Sold as a convenient 6-pack of 8oz bottles, it’s a campground-friendly, California-compliant solution trusted by thousands of RV enthusiasts.

Specifications

ASIN	B08N8G1TGT
Best Sellers Rank	#113,160 in Automotive ( See Top 100 in Automotive ) #45 in RV Sewer Chemicals & Cleaners
Brand	Thetford
Customer Reviews	4.6 4.6 out of 5 stars (882)
Date First Available	11 November 2020
Exterior	Brushed
Item Weight	517 g
Item model number	96689
Manufacturer	Thetford
Manufacturer Part Number	96689
Model	Thetford AquaMAX Summer Cypress Scent RV Holding Tank Treatment, Formaldehyde Free, Septic Tank Safe, 6 Pk x 8oz (96689)
Product Dimensions	15.24 x 15.24 x 10.16 cm; 517.1 g

Reviews

P**L

Product perfect

It works great

30.04.2026

C**.

We Love This

This is the best stuff to kill the stink in your holding tanks. We've been getting it from outdoors stores and it's cheaper than a camping supplier. Highly recommend, if you have never put anything in your holding tanks, then I highly recommend you use this. Even while our 5th wheel has set for the winter, it still smells nice. Great stuff.

16.04.2026

P**S

Pleased with the product.

Good product, works well stopping the odor.

9.12.2025

T**H

Keeping black tank smells down

It works good it's no magic bullet. What helps is water, water, water in your black tank also a I clean my tank with a wand that attaches to a water hose and do that for a hour. The seal under the cap is hard to pull off so I poke a pin hole in it and empty it that way. It's is a little pricey like every thing is. No leaking accured during shipping.

1.03.2026

A**R

It works

Good stuff

28.02.2026

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

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