OK Stinkbud or anyone please explain do the nutes need to stay at the recommended PPM all week or can they go down some? So if my week is say 7 days Monday to Sunday do I need to maintain 2000 PPM all week from Monday to Sunday or do I just have to add back water and track PH to 5.8? And also I would be changing Res/Nutes every 7 days so can the PPM's go down or do I need to add more nutes say on Wednesday? Thanks for any clarification...