Im with Fat_man and have been using 25 lb bags of Jacks hydroponics and Cal nit for a few years now. Ran in coco drain to waste. (Unless im doing outdoor, then I roll organic) Super cheap and seems to work just fine 
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I just started using it as well after growing organic for years. No denying it works very well and I don’t think you can get anymore cost effective for a complete fertilizer.
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