I mix Compo Sana mediterrane kübelpflanzenerde with perlite, vermiculite and EWC in 4:1:1:1 ratio. Brew 2Tbs EWC with 1tsp molasses in 2l water for 12-24h
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It's not as cheap as yours
@Desertboy but i only feed once or twice in veg with Biobizz Grow at 4ml/l and Heaven at 4ml/l then 2-3 times in flower with first feed being Grow 1ml/l, Bloom 4ml/l and heaven 4ml/l and the last two feeds with Topmax instead of Grow at 4ml/l. After harvest I reuse the soil and add 1l of fresh soil and 1l of EWC or compost made of kitchen scraps for every 11l pot. So it turns out cheap after all.
And the soil is loades with predatory mites (H. miles)