Home made Dust Collector

I feel kind of bad for posting a project that I didn’t create, but I just found this homemade dust collector on ebay in a neighboring town. Since I was about to drop a pile of cash on a new DC, I figured it was worth a shot to try this. (Paid $250). Its only a 1 HP motor, but seems to get quite a bit of suction. I wish the chip separator were a cyclone, but the square box style seems to be well built. The entire structure is sealed with furnace sealant to be air tight. I tested it by really having to pull hard to open the door to the trash can when its running. I think eventually, I’ll get rid of the box tower and replace it with a metal cyclone, but for now I’m going to give this a try. The filter bags seem really old and full. I tried shaking them out, but they were just too dusty. Does anyone know a good place I can get filter bags? They are held on a 12” metal flange with a hose clamp and my initial search on the internet didn’t yield any slam dunks. If there are any suggestions to improving this design, please let me know. Thanks

-- Tom, Simsbury, CT