I gotta question about that 800 PPM solution, ok lets say I just filled up my rez & I haven't added any nutes to tha rez yet. (How bout the PH level should I make sure the levels are set before I check the water?) Now I take a glass & scoop a cup of water out of my rez. Now I got the glass with just tap water in it. So I stick the tester in the glass. Now say I need to use the 800 PPM solution. Do I mix the solution into the glass of tap water from my rez? I only have a 8oz bottle of solution. ?? Hey guyd thank u again for tha help, I'm sorry if I keep repeatin myself but I'm just tryna explain myself & my problems.. Thanx...