For a small brewery, I like to use a 20" 5 micron prefilter, then the swimming pool filter c/w activated carbon, then a 20" 1 micron polishing filter. You could use a 20" fixed carbon filter in place of the swimming pool filter, but you will need to change the filter much more frequently. That will end up costing more in the long run. The pool filter is the nuts. Don't be penny wise--beer is mostly water and it pays to get it right. Good luck!