GreaseShield’s GS25-PF is a proactive mechanical grease trap that works in real time by taking advantage of waste thermal energy being discharged from commercial kitchens to remove FOGs before they solidify. The unit recirculates grey effluent internally by pulsing for five minutes on (followed by five minutes off) to promote greater efficiency of FOG removal and to help remove “floaty” dairy products. This process avoids the use of potable water.