I tried the Culligan filter recommended replacement for this Omnifilter and had rusty water for 2 weeks. After pulling out the culligan, it broke in two and fell to the ground. I will always use the omni filter as long as I have this syatem. After two months it's holding together and is still as hard as new. The Omnifilter also slows water flow before it lets in rust and sand. No comparison, I sold Omnifilter.
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