Hard water is a bit tough to work with. Mine is about 200ppm, but I don't know what solids make up that 200ppm. I use the Lucas Method, which uses the Bloom and Micro solutions from General Hydroponics. I've been running at about 80% of the recommended ml per gallon during my grow -- to accommodate the pre-existing solids in the tap water. But if the 200ppm is mainly composed of nutes in the Micro, then do you think I should switch to something like 60%-70% of the recommended Micro, and Bloom at the normal 100% level? TIA! ~jessie