Still waiting on the nutriments to arrive as well as the light.
http://www.htgsupply.com/productdeta...?productID=208

ppm filtered tap water 195
ppm hydro water 295

I am using a HM Digital TDS meter model TDS-4

Is there a tool, or do I need a tool that measures each amount of Potassium, Nitrogen, and Magnesium and other similar things?