I'm thinking about setting up a misting system for the main house AC unit to help the coils stay cooler so the unit will cool a little better and no have to work so hard to hopefully save a little energy and wear / tear on the unit. So far, the best system I've found (cause it's simple, less stuff to go wrong) is the Cool-n-Save Basic Kit found online at: http://www.coolnsave.com/product/cool-n-save-basic-kit/ It's activated each time the unit comes on by the upward air the unit's fan produces which flips a paddle up that turns the water valve on. My question is... I need to find a good inline water hose filter (I'm not using their filter so I can put one over by the water faucet) that is good enough to filter the water so there's nothing in it that can build up on the coils to damage them. If anyone has a good inline filter that can be used with a standard water hose fittings please let me know.