Hey RosaB, my water was coming in around 400-420, so I got a hose filter (called clean water fun, that tip was given me by a grower over at Mendels) and fill up a 5 gall with it, let that set 24 hrs then cut the water with distilled water 50/50, then ph it. I think a little cal mag helps with mine too. I am in no way an expert, im just telling you what I have done now on several grows and it seemed to help my issues. The water is super shitty down here.