Unique RV Digest-It Holding Tank Treatment s powerful blend of bio-enzymatic cleaners quickly digests solid waste and residual sludge build-up inside your black and grey water holding tanks preventing backups and clogs from happening in the first place. This toilet treatment has an advanced blend of bio-enzymatic cleaners that works to remove odor from your holding tanks and rv sewer system infusing them with odorless enzymes so your holding tanks can remain odor-free. Designed to work specifically with The Unique Method RV Digest-It does much more than your typical tank deodorizer it digests all brands of toilet paper and maintains properly working tank sensors and level gauges. The proprietary blend of activated bio-enzymatic cleaners is proudly made in the USA and contains no formaldehyde or bronopol. *Ingredient disclosures are to the best of our knowledge based upon information provided by our raw material suppliers.