yes, so my question again......If Im shooting for a PPM of 1000, is that with my current hardness or do I take it to 1170?Those tables are based on 0ppm water
yep that;s rightYou would need 1000 total, so 830 ppm would have to be added to bring your total PPM up to 1000 PPM
Exactly, however 170ppm is basically the best tap water ever so I wouldn't worry too much about using RO filters personally. My tap is around that and I've been using non pH'd tap for a while and it doesn't make a difference between that and 0 ppm distilled.Yeah you need to add nutes to bring your ppm up to 1000 so you include the 170 from you tap water. 170 ppm tap water is not that bad at all I would use that after running through a carbon filter. My tap water is over 400 ppm. The issue with tap water is you dont now what that 170 ppm consists of so I always say filter your water. I have a 90 gpd RODI filter that I use.