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I have since found that the rule of thumb for residential is 12 gpm. Larger households will probably need a larger capacity.

Frodo, thanks for the info. There is actually quite a bit on that page that is useful.

Aloha, installing a UV water purifier after a sediment filter and carbon filter for whole house water use. I’m getting hung up on how to size the purifier in terms of gpm. I’ve tested my current pump and it outputs 10 gpm. In the future I hope to replace it with a grundfos that puts out 22...

Aloha, new to the forum as a user, a wee bit of lurking in past years. Haven't had much need for lots of plumbing help till now. Redoing bathroom. Am installing a delta laurel shower. After I strip everything out, I'll be repairing some of the original 3/4" floor, adding another layer of 1/2"...