I boiled it several times to get rid of impurities and tannins, but the water in the tank went bad and started killing all my fish. Don't worry if you want this in an aquarium. 30 years of experience with tanks, never tried it - lesson learned.
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π U-BCOO Aquarium Gravel Cleaner Fish Tank: Manual Siphon for Efficient Filter Gravel Cleaning and Water Change in Tanks
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Jasonwell Magnetic Aquarium Fish Tank Glass Algae Cleaner - Floating Brush (L Size)
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