These filters are mainly used for taste and smell and worked on my 5 stage reverse osmosis system. I usually change them after a year of use or sometimes a little longer and for the price I think it's worth it. For reference, I use a 3/8" line from this filter to the storage tank and then another 3/8" line to the faucet for the best flow rate.
NANPU Air Drying System With Double Filters And Pressure Regulator Combo For Clean And Controlled Air Supply
18 Review
NANPU DFR-02 1/4" NPT Air Drying System - Double Air Filters, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl
20 Review
NANPU 3/8" NPT Compressed Air Filter Regulator Combo Piggyback, 5 Micron Brass Element, Poly Bowl, Semi-Auto Drain, Metal Bracket, 0-150 Psi Gauge
26 Review
Filter under the sink Aquaphor Favorit ECO silver
20 Review