
Given the expected life of the units I ordered a stock of each and an extra filter for 2 years and up. They last a lot longer than expected so I now probably have a 5 year supply for life as a full time semi-retired camper. The price for a complete filter change on my reverse osmosis filtration system was more than replacing the entire filter, so I bought a new ROF. These two filters are installed in front of the ROF to make it last even longer. Some filters are nominally half a micron. is it you? Are they reducing the flow?

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