1. Does anyone know of a link or the stats them selves for what concentration (ppm) of nutes that are best for plants at different ages or heights?
2. When you are trying to get the concentration of nuts in the res. to a certain level (say 400ppm), do you want the water to be at 400pmm of total particles or 400ppm of nutrient particles then whatever the epsom salts will add and what the water started at to begin?