Wookie
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I have a line on some used membranes, I have 2, dunno if there are more, but the price is right. About perfect for an SA-6 if you have enough LP air. I’m gonna turn my 5405 down slow enough for it.@RaginCajun to echo what I said earlier and what @Wookie said above, the filters really don't matter as far a being "Bauer compatible" or whatever. They come after the pumping is done and as long as they have a PMV on there to make the final stage happy, the pump really doesn't care.
The Capitano is a 5cfm pump which is quite small so the filters don't need to be that big, and oversizing them will just increase your change interval vs. making the air "better".
I am A HUGE fan of separate moisture separators and coalescers and believe in having them outside of the normal filter stack. Knocking out as much water as possible makes your filters last longer by knocking most of the bad stuff out with the water and preventing your coalescer from having to work so hard. Lots of filtration discussions on here that you can search through, just don't include "bauer" in there because it will probably reduce your results too much.
I am rebuilding a pair of Rix SA6 compressors which are about the same size as yours. One to keep at my place, one to leave at @The Chairman 's house for continuous blending nitrox. They will have excessive filtration put on there in terms of trying to get the water and particulates out, then "normal" filtration for getting rid of the CO and CO2. This will allow the filters to go to their full life since cave country and SC aren't exactly the driest of locales....