Water out of my hose is 75ppm. Have been adding 2ml calmag, which brings the tap plus calmag to 185. Light feed schedule for the nutes says add 2-3ml calmag and total ppm around 560Ok, I'm confused...in 1 post at top of page you talk about tap water plus cal-mag...... then just above post you talk about well water being 75 ppm.....which do you have? Not sure on your life situation or anything, but my thoughts are to eliminate guesswork....Where I live I can get gallon jugs of distilled ( grocery store, dollar general) for about 80 cents. Might be worth it to grab 10 or 12 jugs just to eliminate a variable.