First off we were talking about adding a second filter to an existing small portable unit MCH-6 Bauer Junior II PE100 etc
Hence the DIN Female on the inlet of the second filter to simply hook it up from the charging clamp hose assembly.
The first filter on the original compressor has its original BPR fitted on the Bauer Junior II and Poseidon PE100 it is set at 200 bar.
On the Hamworthy 2.4, Coltri MCH-6, (if Fitted at all ) or the Rix SA-3, have them set at around 100 Bar
When you add a secondaraty stand alone filter system for the second BPR you set this to 200 bar.
For the first one dont dick about with it leave it alone.
Only if you have a MDE Series 35 series 40 series 50 filter tower on the second filter do you need to plumb it back to front.
1. Oxygen backwash when PP filling from a portable compressor that is switched off and drained. hooking up before starting up like you do.
2. You need to bleed filter 1 of condensate occasionally and don't want to desorb contaminates out of filter 2
3. You also need to keep the tower 2 under pressure at all times even when the portable compressor is switched off and drained
4. Bleed velocity on the condensate drain off the compressor is much greater than the 3CFM flow of the compressor another chemical disruption failure point
5. A backflow also creates a pressure drop and this freezes the water adsorbed in the zeolite, this swells up the chemical and is breaks the chemical bonds like a blown brick in an oid damp house.
6. and so on and so on