I've had an iSpring 7-Stage Return Filter in my house for almost 7 years now and we love it. Obviously the o-rings that seal the canister will wear out over time and I ended up buying them off Amazon. It was amazing how good iSpring support is for a 7 year old product. Don from customer service helped me a lot with some leaks and sent me some extra o-rings but I ended up getting them from Amazon as the shipping was faster. Of course I am very happy with my RO. the purchase and even more how well the product is maintained even after so many years.
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