We recommend purchasing yourself some of these inexpensive airtight containers that give a perfect air tight seal. (myketokitchen.com)
Also what kind of preservatives could I add to make them last longer in a storage air tight sealed bag (theplantphilosophy.com)
From cutting the tanks and piping, through ensuring air tight seals and managing the pH of the system, to dealing with the fertilizer byproduct, this is undoubtedly a useful video for anyone interested in trying anaerobic digestion or biogas for themselves. (treehugger.com)