You can get away with a lot of “wild” things over short periods of time. Plants don’t go instantly deficient, and they have nutrients accumulated to allocate from other places. Also, for gypsum, it could be a difference of solubility. If it remains as micro-solids rather than dispersing into ionic forms in the solution, then it will not have the same interactions. It will likely accumulate in the media and break down more as a soil delivery mechanism than hydroponic.
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im currently using gypsum as advised by Corgitron and im blown by the results!
this guy is a legend!
How much did he say? Two teaspoons per 5 gallons? Is that around 10 grams? Are you using it with Jack’s 321?
Where are y’all buying Jack’s? It’s there anywhere online with a decent price? I see they sell direct but the pricing for the small bags is ridiculous compared to the big bags but I don’t have room for them
This is about the best you can do if you don’t want 25# bags to best of my knowledge https://www.ebay.com/itm/192510270227?hash=item2cd2819b13:g:BWoAAOSwy8JctVmd
im using it with maxibloom from start to finish…gypsum at 1-2gms/gal along with 5g/gal of maxibloom…
imo the n:p2o5:k20 ratio and k20:ca:mg ratios of maxibloom is just too perfect!
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Seriously I think gypsum would benefit anyone feeding dry salts.
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Green Genes the reason I started up with the Jacks used Mega Crop last couple grows super easy to follow no issues throughout grow plants just had no character scent flavor. So switched up
Thanks! Just got my RO system installed so I’m looking forward to having a stable pH and not all that sodium this time around, along with getting away from liquid nutes
Interesting!
I’m feeding the same amount of maxibloom but doing ~3.5ml of calimagic for my coco flood and drain. Been having pretty good results but you’re making me wanna grab some gypsum and flora micro to try out instead of the calimagic 
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I’m not sure how gypsum would work on a flood and drain. It’s a solid source for calcium though.
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that sounds like a lot. I use about half a gram to a gallon. Thing I am afraid of here is the sulfur …but as long as the tips of the leaves aren’t burning and curling probably ok.
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When you get a S toxicity it’s more like degradation of leaves before tip burning.
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