The old Delta DC that I found last year had terrible bag filter (I doubt that it even had a micron rating) so I bought a canister filter on Amazon.  Much cheaper than the Wynn but still has a MERV 15 rating.  The prices seem to have have increased a little recently  but are still cheaper than a comparable Wynn filter.  This is the one that I bought to fit my smaller 1HP DC but they have a larger one that will work better for larger DCs.  Another option is Donaldson filters that are also Merv 15 rated.  Shipwright did a write up  on another website a while back about using them to upgrade his HF DC . 



The biggest problem I had getting this DC setup was sealing the clear collection bag on the bottom.  The bag clamp allows enough air to leak out that it  was spewing a little dust into the air.  The solution was to use some of the narrow stretch wrap found with the moving and packing supplies at HD.  A couple of tight wraps around the top of the bag and clamp sealed it up.  It will be easy to just wrap again when I empty the bag.  I keep the stretch wrap in the shop to help clamp awkward shaped glue ups. 

Speaking of canister filters and dust collection in general.  I stumbled upon this YouTube video that used a canister filter and an inline blower for a air cleaner.  The  the air cleaner  is at 1:18  but there are some other tips in the video that might be helpful for some. 







--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.