Draintain Drain Opener & Deodorizer Draintain Drain Opener & Deodorizer is a proprietary five strain bacteria, genetically engineered enzyme that liquefies solids and digests organic waste in drains. Draintain is an ideal drain opener, cleaner, maintainer and malodor counteractant. Apply manually or can be used with the HT Products Drain Maintainer Metered Dispensing unit.