I just use plain old tap water. PPM are 170. Do I need to use Cal Mag per instructions on the bottle? From what I undderstand its only for those that use RO or distilled water but I also read that its good to have in case you notice a cal/mag defeciency. Would it hurt the plant using cal mag in my case given the ppm of my tap water.

Peace
GodBud Reviewed by GodBud on . Question on Cal Mag Plus I just use plain old tap water. PPM are 170. Do I need to use Cal Mag per instructions on the bottle? From what I undderstand its only for those that use RO or distilled water but I also read that its good to have in case you notice a cal/mag defeciency. Would it hurt the plant using cal mag in my case given the ppm of my tap water. Peace Rating: 5