Posted 09-10-2003 at 08:35:44
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I installed one at the previous house that was on city water, and there was one already on the current house that has a well so I've seen it both ways. Both of my systems used a double filter.
On the city water I used a 10 micron sediment filter as a pre-filter followed by a carbon filter to take out the chlorine taste.
Here on the well, I have both sandy and irony water. I now use a 20 or 30 micron prefilter followed by a 5 micron secondary filter. I was originally using a carbon filter as a second filter, but discovered the plain well water tasted great without it, and the carbon filter would start tasting bad itself very quickly...I'm guessing it harbored bacteria after just a week or two so I just replaced it with the second, finer sediment filter.
I go about 3 months between changing filters with this setup. When I was using a 10 micron prefilter here I had to change monthly.