The Pentair filter cartridge is 10 inches long instead of 9-3/4 inches. Thus, it does not fit in a standard cartridge case. The top of the housing cannot be closed properly as the 10" long filter cartridge will prevent the top from sealing against the o-ring. There will be serious leaks. I have requested replacement cartridges through Revain. Hopefully someone will measure replacement cartridges before shipping.
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