For me (in Netherlands/Europe) it was to much work/space (gravity filters) and when starting use about 10% = beware of old residue getting loose and clogging filters.
Also government was not supportive (love $hell democracy) and tax evading is a big crime, also a crime was storing 1000 liter waste (the oil) etc.
Centrifuge seems way better, a group of people may be easier to cope with the work and cost?
If you REALLY want to build your own centrifuge,this is the key piece: Includes: -Rotor -Seal and clamp -Parts list for centrifuge
www.wvodesigns.com
PDF here:
Biofuel_ebook_v24.pdf
Al lot of pictures and txt of what I tried:
There are many websites about this so read somewere else... 3450 rpm centrifuge and introduction: https://www.wvodesigns.com/products/centrifuges.html
www.tapatalk.com
The metal oil barrels were very nice because of industrial size, but I would now use the 1000 liter plastic IBC: bigger scale and no rust and also same industrial size 2 inch.
And in the beginning biodiesel was a green eco thing, then it changed to murder (because instead of diesel farmers should produce bread) This stopped the whole chain.
I just see another big company is broke, they had many trucks and huge storage tanks:
Op 27-08-2019 is
Biodiesel Kampen B.V. te
Kampen (Overijssel) failliet verklaard nadat de surseance beëindigd is.
And this company is from two guys who managed to get all the tax and government permits (unreal quest) and were allowed to sell biodiesel, I don't know if they still exist:
Biodiesel | 2N-BioFuels
And a neighbor farmer had 100k invested to produce bio diesel and then the government changed the rules and the money was gone, when I asked him:


