Before purchasing, I contacted iSpring support to inquire about the differences between the FA15 and FA15US models. The seller, Don Huey, was very friendly and quick to respond. Basically, one is made domestically and the other abroad. In terms of quality, foreign countries work well. So I bought the FA15 model. It was a quick install as it came with connectors. As the small instruction notes, we need to drain some of the spring water from the filter. I drained about a gallon to make sure the water that came out was completely clean. I did not purchase like some of the other staple packs. I just used two zip ties to tie it to another filter. This works great for me to save a few bucks. The water tastes slightly different, but it's hard to tell. All in all, this is a good buy.
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