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A biological holding tank treatment formulated for use in all boats, ships, recreational vehicles, and portable restrooms. An environmentally safe, economical and easy-to-use concentrate, Drainbo will penetrate, degrade and digest biological waste, household grease and detergents. Adding Drainbo regularly to your tank will keep your toilets fresh and the waste digested. Adding it to the galley or kitchen sink along with the shower and bathroom sink will keep the gray water tank fresh and drain lines clean and flowing smoothly.