What do yall think about my wmo filtering setup? It has a 5 micron polypro filter then the gearpump and then a 1 micron polypro cored string wound filter out. I plan on using a pp string wound filter on the 5 micron. Whole thing sets on an open top barrel that I heat with a hotplate pressed snug to the bottom for dewatering.
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I have been using the whole house style filters made by Pentek for about 10 years. I have happy with them, except if you run gasoline-waste oil blends, like I do, then the alcohol in the blend will cause these polypropylene filter housing to swell. So, when you go to change the filter, then you will find the housing will not screw back together, until it has sat in open air for about 6 months. So, I know of several sets of Pentek polypropylene filter housings.
On the type of o-ring to use, Viton is best, because it resists solvents better than other o-ring materials; however, they tend to be expensive and difficult to find. So, as long as you keep the diesel in your blend at or below 50%; and or, the gasoline in your fuel blend down at or below 30%, then BUNA-N is fine, cheaper and easier to find.