Overall the filters seem good. I am very happy with my reverse osmosis device. I noticed that the unit backwashed almost constantly and realized it needed new filters. I have approximated the service life of the original filters to 8 months. I was amazed how black the original filters were when I replaced them with new ones. I've attached a photo of one of the old ones next to one of the new ones. The first and second stage filters were all black with iron.
NANPU DFR-02 1/4" NPT Air Drying System - Double Air Filters, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl
20 Review
NANPU 1/2" NPT Air Drying System - 5 Micron Particulate Filter, 0.01 Micron Coalescing Filter, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl W/Metal Gauge
23 Review
π§ NANPU 1/2" NPT Compressed Air Filter Regulator Combo Piggyback with Auto Drain, 5 Micron Brass Element, Poly Bowl, Metal Bracket, and 0-150 psi Gauge
18 Review
NANPU Air Drying System With Double Filters And Pressure Regulator Combo For Clean And Controlled Air Supply
18 Review