Condensate is the water that is left after ignition has burned gas in a high-efficiency boiler, water heater, or furnace. It is extremely acidic and needs to be neutralized before it goes into piping systems, sewerage systems, septic systems, treatment facilities, and other items it may contact so it does not cause damage. Many communities now insist that condensate be neutralized before it enters the common drainage system. The most efficient way to accomplish this is with the addition of a condensate neutralizer.