I use them on the sink in the laundry room to filter my dog's water (yes I know I'm crazy). They last about 3 months and are easy to replace. Of course, if I don't get a product to test to see if it actually removes contaminants, I can't test if it does what it says it will. But I like to think that I'm keeping my furry baby healthy by filtering out impurities in their water.
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