This is an arti Sytle digester
Two cylindrical water tanks, one fitting inside the other.
Cut the top off of the larger diameter tank.
Cut holes out of the top of the smaller diameter tank.
Turn the smaller diameter tank upside down.
Put a 1/2 inch uniseal in the bottom of the smaller diameter tank (which is now the top of the gas holder).
Put a hole at the bottom of the larger tank and insert a feeding pipe to the middle.
Put a hole about 20 cm down from the top of the larger diameter tank and put a pipe with three elbows in it so that the effluent pipe comes up just near the top of the tank.
Our original tutorial showed the use of a tray inside the digester to give microbes more places to live in the warm area of the tank as shown in the video below:
We have since modified that to the insertion of hanging microbial motels. And we've combined it with the IBC digester, using the ARTI for gas production and storage in the summer and gas storage in the winter (with the IBC producing all year round).
if we have a manual (which is what we are aiming for) we place it here