Magnesium + Phosphate compatibility in stock solutions

HydroLynx

Well-Known Member
I have noticed from making my own "Bloom" stock solutions last year that after an hour or so that I get a nasty slug precipitate forming, which contained MgSO4 + MKP + KNO3

MKP + MgSO4 in same stock tank or bottle apparently is fine acc to some people, but others (like Haifa) say no those are NOT compatible. But htf does GHE et al get away with adding MgSO4 with MKP ions (orthoPhosphates) WITHOUT a sludge forming? What do they know that I don't...

Common sense tells me that Magnesium + Phosphates, should behave and be treated like Calcium + Phosphates that make sludge after some time, and seems like a real unpredictable mess of Apatite-like substances can form according to chemistry literature.

What am I missing? Acidic pH offsetting the precipitate maybe? Secret chelation? But I suspect it's likely maybe the fact that I had traces of ammonium ions from some ebay-type dodgy KNO3 in the bloom mix, which may make Struvite precipitate (MgNH3SO4) which is found in kidney stones.

My test mixes of KNO3 + MKP + MgSO4 don't precipitate as much, but that was only in 50ml test tube sized experiment.

Nonetheless I have since formulated a better mix by sticking Mg(NO3)2 salt with the "Grow" formulation (as N and Mg have simulation), and don't even need pyromaniac-loving KNO3 anymore as I will be using K2SO4 for bloom, but still this issue burns my curiosity...

I read the first 10 pages of this post, and was like fuck it may be easier just to ask directly "HOW is this done"

http://rollitup.org/t/reverse-engineering-everyones-nutrients.893906/page-10
 
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