Early I grew using dwc, then E&F with exclay, drip irrigation with vermiculite, then I had problem with coconut (althouhg, many grow good with it), then I tried Grodan wool and it was good. After such experience I’m always near the wool. Theoretically salting shouldn’t be, though I can’t say how often have to flood.
I know growers who grow just on salts. There is no magic with calculator. One bag of 25 kg per 5000 liters of solution is enough. No additional sulphate, nitrate and other crap. All in one bag. Agrochemical for greenhouse with tomatoes. In general, complex fertilizer is salts with water, it is just diluted and bottled with a beautiful label. But I'm lazy, I prefer to pour from the bottle.