25PPM out you are good. You have what is called a food grade RO machine. 0PPM is worthless for human consumption but is needed for exotic aquariums. My city well water goes in an 600+PPM and comes out at 30PPM and my filters are old. When new, it never went below 20 PPM.what kind of ppms are coming out of your RO system with well weater? my 300+ppm tap water comes out at about 25ppm..
Place is suppose to have good water pressure though
Doing aeroponics so RO is a Must