Hey DGC just wanted to offer up this information. Zero water filters. The 1 gallon, 5 stage filter works with carbon and other things I cant remember but your water is 0 ppm. Lots of people might already know but you can buy a zero water filter pitcher for 20 dollars or 40 for the 4 or 5 gallon spicket type. They all come with a ppm meter so that’s about a 10 dollar value in itself. I’ve been using mine for 3 months or so and the water is still at 0 ppm. Also the other brands are garbage so don’t bother with them. This is a very cheap option compared to buying a ro system the downside is it takes a bit to filter. Thanks dgc hope this helps someone.