use a refrigerant flare type filter the function of wf is to filter any foreign matters in your system. without wf, it will do for a while but will surely clog your system tubing. if your using a copper tube as your water line , you can use a flare type filter( use as filter for refrigerant without the silica gel) it is cheap and will do as a your filter.
you have to flare your tubing first to install the filter. it will clog later on.. just reverse the filter and purge it with water until you flushed the foreign matter and put it back again. you can use the size 1/4, 5/16,3/8 flare type filter |