Did you forget about your promise? Where’s the flow hood?I'll post up a picture of my flow hood later today sure thing.
The polycap filters I use are fine for oils especially considering I only push 5 litres through per unit. My oils are crystal clear and without contaminants.
I have not consulted with Jano regarding the purity of tren-base/deca aside from asking if these compounds normally test lower and I was told they normally do. This is a good question for him no doubt. Perhaps oxidation plays a part as tren base raws change color very quickly when exposed to air.