(2.5 lbs) Ultra-Fine Food Grade Gypsum for Mushroom Substrates, Brewing, Tofu - No Additives, 97% Calcium Sulfate 22.5% Calcium (Ca) 18% Sulfur (S) - Packaged in HEPA filtrated enclosure for sterility

This ultra-fine lab grade gypsum is fantastic! I use it for a variety of crafting projects, including making molds and casts. The fine texture makes it easy to mix and pour, and it sets quickly to create detailed and precise casts. The quality is top-notch, and the gypsum is very smooth, resulting in a flawless finish. Whether you're a professional or a hobbyist, this gypsum is a great choice for your crafting needs!

Has worked well with my grains no contams and have nice growth everytime i use it.

Perfect addition to my substrate so growth in less than 24 hours with my grain spawn to bulk substrate two monotubes set up and both same results growth in less than 24 hours.

This gypsum I highly recommend for mushroom growing. I have had absolutely no issues with my millet clumping in a ball after pressure sterilization and no contamination at all from using this one.

Arrived as promised and in good condition. Seems to be as described, no none issues. I wish that the package sealed back together better when not in use, but nothing another zip lock bag can't handle.

Excellent for use with mushroom cultivation.

Fine, powder consistency gypsum, for a decent price. Can’t beat it!

Just get cookin!