Dry Ice

another option is....
CoBoost-Pump.jpg

CO2 Boost - All-natural CO2 Generators for the purpose of CO2 enrichment and air fertilzation
 
so true soso true that is like perfect for a home closet setup. plug and go just water and feed suger bi-weekly
 
i make my own bread and have a thing of sour dough in a vented tupperware in the fridge for months on end as long as i feed it occasionally
 
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