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I actually want to figure out the CHEAPEST hydroponic fertilizer I can, I'm planning on turning a bunch of rubbermaid bins into kratky pots for lettuce, tomatoes, peppers, etc. I'm going to get at least 6 of them. At 20 gallons each, and the water needs changed every few weeks.....it'll add up if I go with something like General Hydroponics.
I watched one video on youtube where a guy very successfully used Miracle Grow blue crystals and epsom salts. I'm starting some kratky style mason jars for lettuce in my grow tents to experiment with nutes before summer.
That is a fairly large operation and will require a lot of fertilizer to make 120 gallons of nutrients every two weeks and probably half again as much for makeup?
Something like this is about as cheap as you can get until you go commercial sizes