filters received today and replaced filters for the first time in my life BUT I've only been using about 12 gallons of reverse osmosis water a week for my saltwater tank water, so I figured the old ones would be clean. I have city water that isn't clean but you don't expect the 1st filter was full of silt, I mean sludge! Luckily I'm moving to a new house with well water BUT now I know what those filters do and need to be changed.
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