It's big and seals well. I had to upgrade to a larger case after not being able to find the thinner cartridges I had previously used. I was hoping I wouldn't have a noticeable drop in water pressure and so far there has been no drop. Everything seems as before. The cartridges appear to have a "pre-filter" section rather than the thinner cartridges. I hope they last longer. Great case, easy to install, works great.
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