Ultimate ½ Pint Substrate Jars (12-Pack)Ultimate Half Pint Substrate Jars (12 Pack) Freshly Made Sterile Fastest Colonization on the Market (ON SALE!) After over 15 years of refinement, weve perfected the art of substrate jars. Our Ultimate 8oz substrate jars are trusted by growers across the country for their consistent results, unbeatable colonization speed, and superior yield potential. This isnt just another PF Tek jarits a carefully balanced formula of: Organic Brown Rice Flour

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Raised labeling surface simplifies strain identification

Great for Bulk Growing – Ideal for monotubs

The mushroom monotub fruiting chamber is one of the most efficient and accessible methods for growing mushrooms in large clusters

which can cause caramelization — make sure your pressure cooker isn't running far over 15 PSI

Technical Specs

Dimensions: 18" L x 13

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Ready-to-Use • Pasteurized • Balanced pH • Ideal Field Capacity for Monotubs & Bulk Grows

Real in-home grow results using the Grower’s Select SMALL 28Q Monotub 2-Pack

Easy to install & maintain — just remove the old gasket and press the new one into the lid groove

limited access locations