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Water does nothing to get rid of gum, so it tends to stick around – literally. You don't want it in your pipes!
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If you're fishing hairballs from your sink or tub, don't dump them in the toilet: That's just moving the clog from one part of your plumbing to another. Throw it away instead. Learn how to unclog a shower drain here.
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TV makes flushing pills look dramatic and effective, but it's a horrible idea. If you have pills past expiration or just don't want them in your house, find a local medicine take-back program or grind them up and throw them away on trash day. Otherwise, those potent chemicals will get into sewer systems and even groundwater, where they can do untold damage.