Quote:
Originally Posted by dapellegrini
??? What does this mean? I just mixed up a 20x dose (for 60-gallons) of KNO3, KH2PO4 and K2SO4 in 500ml of water - I get crystals of something undissolved on the bottom of the bottle - did I perhaps break some rule of solubility?
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At a given temperature there is a limit to how much of anything will remain in solution with water. So, you need to stay under that limit for each of the fertilizers dissolved into your fertilizer cocktail. Since most of the fertilizer is KNO3, that is really the limiting factor. You don't really need the K2SO4, so it might help to omit it.