I spent several weeks researching different water filters for the whole house and settled on I Spring. I've seen several reviews stating they had leaks and a couple reviews even said the main body cracked during installation. In my opinion the best water filter in this price range. main organs; (to which water pipes are attached and filter canisters are screwed in) is actually made of plastic. but it is very thick and firm - I was very impressed and very pleased when I received it. When you pick it up, you immediately feel its weight. these things are meaty! I would suggest wrapping 6 or 7 full turns of teflon tape around the fitting that you screw into the body. Other than that I had no leaks and the plumbing was installed within 3 weeks. Also, you don't have to over-tighten the fitting, I used a 10" wrench to reduce the leverage and just put reasonable pressure on it. The filters themselves are also quite powerful and can withstand a significant load before you start to notice a noticeable drop in pressure. just this week i noticed an improvement in the taste of the water and started noticing a difference in less water stains on the dishes after washing etc. I think it will take a few months to clear all the water lines a bit before a real difference is seen. I had a cheaper system about 5 years ago and it broke after about a year due to leaks and constant filter changes. Then this summer I decided to try a better system. I highly recommend this product and especially this manufacturer. By the way, I also ordered a 4th stage, which is not installed yet; (Flex line will be changed to solid copper once I install the 4th stage). It was a large 20" blue filter and did not come with a mount. My problem. I contacted ISpring and they told me that the mount is not included in the kit I ordered. But in the same breath they said that their customer satisfaction is the most important thing and they send them to me totally free without asking me. So just stop reading the reviews and order their products and your water quality will improve!
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