Pure FM-3333 filter system works well. However, such cases do not last long. On average a year or so. Luckily, they're inexpensive, so spending $15 a year on them isn't a disaster. However, this one replaces the one I bought less than 6 months ago. Pure they really need to build like they've done before so they at least survive the non-replaceable internal battery before leaking or restricting water flow to the point where they're useless. If you contact Pur about the warranty, you will be asked to return the system at your own expense. I have five filters left and when they run out I will buy a different brand of faucet filter.
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