
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.

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