These units work great in applications where you need to filter solids or sludge out of the liquid. The type of filter bags you insert determines the size of solids allowed through. Filters as small as 5 micron and smaller are available. The dual 9 filter pod system can process about 2000gpm (100 gpm per bag). Great for Frac Supply and supplying water to camps and systems where limited amount of solids are tolerable.