Cuno Replacement Cartridges B Series Cuno Model B3 Filter Cart. .2 Mic

I am using the 3M Cuno M2P Dual Cartridge setup, with two B3 filters. They work in parallel so as to provide greater flow, as opposed to a single unit. I am using this in a vacation home located on an island with a cistern, which is against the manufactures recommendations. It is intended for Marine and RV applications and is not recommended for Residential Use, so I am breaking the rules.

A single B3 setup is rated at 3.5GPM and a 15,000 gallon life expectancy. In a dual configuration they are rated at 16GPM which is a four fold increase flow capacity, and of course double the life at 30,000 Gallons. 3M also offers the smaller B2 cartridge rated at 2.5GPM and 7500 Gallons.

I have my house plumbed to supply all but toilets and outside faucets from this filter setup. I''m considering dropping the washing machine from that and supplying it with only cold primary sediment filtered water since the climate is very warm. This would remove some load on the filters, possibly as much as 3000 to 5000 gallons per year.

I am also using a GE Whole House Filter Housing with an FXWTC sediment filter upstream of the B3''s in hopes of further reducing the burden. This filter also has Carbon for odor and taste. I might change to a spiral wound filter for fear that carbon particles from the FXWTC are plugging the B3''s. I will dissect one to examine it for particles.

In conclusion I don''t feel I am getting the life expectancy I had hoped and they are expensive to replace. Though they do need replacing sooner that expected I will continue to use it, it''s just too valuable not to. I''m budgeting about $250 per 9 months of use. I can probably stretch this to a full year if as I indicated above I bypass the washing machine.