"Epsom salt (MgSO4-7H2O) has a 9.9 percent magnesium content.
Magnesium chloride (MgCl2-6H20) has about a 28% magnesium content (if I recall). So use about one third the amount...
Or if you need to buffer up your pH anyways...you can…"
Welcome to the group. That's an open question, there are a few easy system designs that we build. There is the media-based units, Nutrient film Tecneque (NFT), DWC Deep water culture also known as the raft…"
"Nope, I did not encounter any such problems (even when I was using the rockwool barrier between the two layers with mineral supplements). In the hot pepper pots I did not use rockwool and did not use any mineral salts."