I was reluctant to buy cartridges from other manufacturers and I should have listened to my doubts. I installed one of these cartridges yesterday and the material is much coarser than the Culligan brand so I doubt they actually filter 5 microns. After installing the cartridge, I noticed that my faucets and shower head regularly "spit". This is not due to the air in the lines from changing the cartridge (the air in the lines went out in the first few minutes of use). This "spitting" is likely the result of a momentary increase in pressure/flow as the water finds a less stable path through the cartridge. These cartridges will likely last longer than Culligan cartridges simply because they don't filter down to 5 microns and therefore don't clog as quickly. I will not buy these cartridges again.
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