Originally Posted By: ZeeOSix
Don't really see a need for a "per-filtering layer" of foam on an oil filter. On an air filter yes, it does work to help keep the main element from packing and clogging up too fast.
The outer layer must be more open (porous) to allow flow. Then the oil hits the white media inside, which might be the usual Royal Purple style white stuff for all we know.
Being so porous, I can't see how the outer green layer will catch smaller particles.
Just seems like they lost their minds. These cartridges seem like all Marketing Bark, no bite! Need proof.
What you say about how an air filter can benefit, I'm trying to see the benefit of gradually lowering the pore sizes as you get deeper. Guess we need actual test results, which Microgreen won't provide. The covering-concept does seem to be a departure from their old approach, no parallel flow.