I use these filters in the iSpring 6-Stage Reverse Osmosis Filtration System. I've been using this system for five years now and I like it. I took off a star from "Easy to Install" because you have to remove the blue clips and disconnect the hoses to pull out the old ones and replace them with new filters again. My filter system is in a darker area and the blue clips fly off very easily in the dark and are never found again (this happened a couple of times and iSpring was great and sent me a pack of blue clips). is free!). The filters themselves do their job very well. I use the reverse osmosis filter for about a year, I change the remaining filters every 6-9 months. I have a water meter, and even when I replace it, it usually reads fewer parts per million than when testing store-bought gallons of water. I love the filters and the iSpring filter system. I love water so much that I take a thermos of ice water to work to avoid drinking the city's chlorinated water!
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