
If you have a reverse osmosis system with a tank and filter canisters this is a standard size and will fit. If you have a tankless reverse osmosis system that uses rotating inlet and outlet filters, this is NOT for you. This applies to the first 3 stages, 1 sump and 2 activated carbon filters. The sediment filter should be changed every 6 months and the activated carbon filter about once a year. With that in mind this should really be sold as a 4 pack with 2 sump filters and 2 charcoal filters. It would make more sense.

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