I looked recently at the possibility of getting an "undersink" filter that I could install in our camper. We "need" a filter there, since even when the water is safe enough we encounter a lot of "variable taste."

We've used a Brita pitcher for several years, but the filling (a pot of coffee takes an entire pitcher), and finding places to put it in our small camper, stimulated an interest in something more convenient.

I found both Brita and Pur, along with a couple of others, at local "home improvement" outlets, and the initial cost was quite reasonable for most of the smaller units. The only "stopper" was that for all of the units I looked at the cost of a single replacement filter was more than the initial cost of the filter.

Checking the recommended replacement frequencies (against number of pots of coffee) indicated that we'd essentially (costwise) be buying a new system at least once per year in order to have "convenience" for the roughly 4 to 6 weeks that we're in the trailer in most years.

I decided to stick to the Brita pitcher ($3/year?) instead of an "installed" system ($40 - $60+/year?).

The units I was looking at were, of course, smaller than I'd want for a house or other regular/longer-term use, and larger units may come in a little cheaper (per pot). My choice, in pitcher style filters, is based largely on the more ready availability of Brita in local markets. It's easy enough to find Pur pitchers, but the Brita are more frequently seen where I shop.

John