I ordered these to replace my entire well water filter. My understanding is that it should always be thread filter cartridges and each brand's descriptions really offer no other indication. so i went with it. It seems like 5 microns is too tight but after the first change of the old iron plated filter cartridge the water definitely has more flow and seems to have less smell. Needless to say, this should help keep pipes and water heaters cleaner than city water filters. even if i have to change them. The filter cartridges appear to be very durable, but I had no fitment or flow issues when installing them. Unlike some others, I didn't have any issues with the size either. Alignment was my biggest issue, mostly because my filter was mounted at an angle rather than parallel to the ground. but that is not due to the filter cartridges. My filter system is an Omni 1B with a water softener and I always had to add iron salt in addition to the standard solar salt. durability for comparison. At the moment I'm rating these four stars as I expect them to filter water significantly better than older brands/types of filters. especially since they are 5 microns in size. As always, your mileage may vary.
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