To be honest, the tester & solution where bought from tha same website, but not from where the system was purchased. So your tellin me that 800 PPM solution is NOT for that meter I'm using? A friend was tryna help me out from destroyin anymore seeds so they figured they purchase some new supplies so he bought the tester & the solution, its crazy because niether 1 of us kno crap about growin anything, I guess he figured that I should have something to test the water, so he bought them supplies... So am I juss better off using spring water or tap water for my rez? Its easier for me to use tap but if its safer to use natural spring water I do that..