I had the PUR system for my water cooler and was happy with it. Unfortunately, it was discontinued, so filters for the system are no longer available. My research to find another system to filter water found there were plenty of faucet filters and cup filters, but very little to fit on top of a water cooler. This system fit the need. It takes a different approach in that with the PUR, you filled the top tank at the sink. With the Zero system, you pour water into the top tank as it sits on the cooler. Instead of filter indicators that let you know when to change the filters, you measure the purity of the water with a meter that is provided and change the filters once the purity level decreases. My initial filtering tasted a bit strange and wasn't as pure as it should have been. That turned out to be due to operator error. It has been fine since I corrected my mistakes. The water now measures pure and the taste is very good, I wish the measuring of the water for purity was replaced by some sort of simple indicator, but I get that the reason it is done that way is because the hardness/contamination of water varies by location, so how long the filters will last varies as well. Waiting to see what kind of durability I get from the filters before passing final judgment, but so far, so good.
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