We live in Las Vegas where GIP is 14+. I installed it on our main faucet line with no softening, so the diaphragm probably won't last as long, but that's ok. The current is fast and there is more than enough water in the reserve tank for a family of 3. Installation was easy, instructions are in English. The water is crystal clear and leaves no residue on the glasses. The water tastes a bit sweet, I'll take other reviewers' suggestion to use an alkaline filter next time, but it's no big deal.
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