With my water they last about 5 months before becoming too slow and noisy. I see no problem with the "Made in China" aspect. Anyway, they produce water faster than older models, but I haven't timed it. There is enough iron in my well water and I would know if they weren't working properly and that's not a problem. It's nice that I can get them in Revain - Prime much easier than going to Big Orange. A tip: if you switch sets, move the old post filter to the pre filter's position and simply set the new filter to post. I've been doing this for about 5 years now and it works well. Save some money. No doubt the manufacturer would say it's a bad idea, but I measure the quality of the water and it's great. My membranes seem to last forever, but maybe that's because my water doesn't contain chlorine.
NANPU Air Drying System With Double Filters And Pressure Regulator Combo For Clean And Controlled Air Supply
18 Review
NANPU Compressed Air Filter Regulator Combo: Brass Element, Semi-Auto Drain, 0-150 Psi Gauge, And More
21 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
NANPU DFR-02 1/4" NPT Air Drying System - Double Air Filters, Air Pressure Regulator Combo - Semi-Auto Drain, Poly Bowl
20 Review