To make silage it is necessary to have fish and/or entrails, acid and the equipment to grind and to mix it all together to a homogenous mass. Equipment must also be where the finished silage can be stored.
The refuse of the fish are grinded at the same time as the acid is held in.
It is necessary to secure hat there is enough acid, so that all the silage has one pH value. This is among other things affected by how many bones are in the silage. Bones neutralize acid, and will therefore cause the pH levels to rise again after a certain length of time. If the pH level rises above a certain amount (pH 4,0 – 4,5 for formic acid) the silage will decompose. It is then necessary to put more acid in the silage.