Hydrologic "tallboy" and "smallboy" filters aren't RO filters. They're merely sediment filters. Most retailers who sell R&M/CAP products don't know this, because R&M does not include this information in their wholesale catalog descriptions. Gotta find out the hard way. Boy is that a mess...
Anyways, to the OP: Why do you need a filter? You got chunks coming outta your hose? Straight tap works fine for me.