I needed a dust collector system, without parting with any $$$, for sanding cyano or resin applied to balsa. The vacuum chamber of a vacuum forming unit I have fit the bill but what brought it all home was an ancient Rainbow vacuum cleaner. The Rainbow system uses a pool of water in its base to filter and trap the dust and fumes. (Which begs the question; which came first, a bong or the Rainbow vacuum?) It's also much quieter than a shop vac.
Sanding the cyano was beginning to affect my eyes and breathing. Using the unit eliminated the effects and wearing a mask made it even better. The plastic backed sandpaper works great. It easily unclogs and seems to keep cutting longer.
Ara