I have the filterdirect 100gpd 6100nt, and I love it. I dumped maybe 10g before I started using it. I got a TDS
meter too, and it tests out well. I highly recommend spending the extra few bucks for the pressure tank. Without it the water comes out at a very slow trickle. With it, you have 2+ gallons of RO
on tap. wouldn't be able to use it for drinking water without that. Also, while a 5+ gal
pressure tank would be more useful for me, the 2.5 works pretty well. Get the drinking facuet too. it's so nice.