Yes, you can put Drano in a tub with standing water, provided you check the specific product label first, as certain gel formulas are specifically formulated to sink through standing water to reach the clog. However, if the tub is filled to the brim, you should bail out the excess water with a cup so the chemical does not overflow or dilute excessively. Callout type="warning" title="Hygiene Warning": Wear rubber gloves and safety goggles when handling caustic liquid drain openers. Verification: Follow the waiting time on the label before flushing with hot water.
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