Have been using Pur faucet filters for at least twenty years. During that time I tried others. While others may excel in one or two areas, primarily durability, Pur excels in the most important one: how well it filters. Pur cartridge packs come with a long and detailed list of what they filter and how well, for each of dozens of items. No other filesystem I've used does this. Unfortunately, since the faucet block is mostly made of plastic, it is prone to cracking and leaking, which is not easy to repair. Pur does offer a stainless steel block, but for about three times the price. Easy to install, even easier to use.
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