Hey ukTuk Just as a heads up you already know about 6.5 Ph basically being the neutral for cannabis growing! I also have hard water that comes out my tap. So I invested in a ph meter and regulate my water everytime I fill the jug up. Maintaining Ph is important because by it being faulty it also occasionly opens the door up to other fungus/pestilence or god knows what. Definetly want to be seeing a happy gardener @ harvest! Keep up the good work & enjoy your grow!