Question:
i live in the city in california and i want to put a water purificationsystem in my home.

i've learned that reverse osmosis wastes a lot of water to produce thepurified water. i don't understand how this could happen, but itdoesn't appeal to me at all.

i'd rather use a basic two stage filter which doesn't seem to waste anywater.

BUT, what will be passing through that reverse osmosis would normallytake out? i can't seem to find this informaiton, they both seem to havethe same list of filtered items.

anybody know?does uv filtration matter in the city?

also, would it be redundant to add a whole house filter, and then a twostage filter under the sink?

Answer: There is no "THE" ratio, it varies according to the design of the ROsystem. Mine is (according to the installer) about 2 gallonsflushed for every one purified. They had a high end model that wassupposed to approach 1:1, but I don't have any need for that, whereI am, given that getting rid of water is more of a problem thanfinding it.

As for UV "Filters", they don't remove anything from the water.They irratiate it with UV light, and any organism that can'twithstand that amount of radiation croaks, while any organismthat can, happily breeds deeper in your water system, feedingoff the corpses of it's dead brethren.