Blackline Mfg.'s Filter One filtration system performs two tasks: First, it catches all cleaning liquids and ink and emulsion solids from the washout booth that would normally go straight to your septic system; and second, it filters that liquid before pumping it out of your waste drain, keeping solids in a separate compartment.
Emulsions, if disposed of in a septic system, will eventually clog the pipes and, if the user is on a private septic system, the tank as well. Bacteria that would normally attack human waste is instead attracted to the emulsion, thus upsetting the chemical balance of the waste system. Blackline's Filter One HP prevents this, and when used in conjunction with biodegradable solvents renders them drain safe.
If you screen print, you need a filter system. It is that simple. There are too many sticky solid particles that will go down your drain otherwise. We would rather buy a filter system than call a plumber every 3 to 6 months.