Stock up RO water 1 buck gets me 5 gallons,I use 10 gallons aweek and its pure no ppm, you can fill a 5 gal jug at sweatn\bay or other grocery stores. you can get your ppm right where you want it. In my opinion, that 600 ppm your well water is reading ist TDS in the water and needs to be accounted for in your total ppm read. if you want ppm to read 1k then you mix your nutes with that water till it reads 1k, so that would be 600ppm in nutrient solution to your h20, meter knows no difference b/w ppm in water and in nutes. PPM is ppm bro, thats why using well water or tap that is high b/f you even add anything can be brutal and make life a lot harder. In my opinion if your gonna bust your ass to grow good buds give them great quality water in the end it will be best for you and the plants.