Add K-37 SEPTIC TANK TREATMENT to your septic tank once a year and have peace of mind that your septic system is working properly. K-37 is formulated with RoeTech, our exclusive bacteria to break down sewage waste. There are no harsh chemicals that can destroy the natural bacteria needed by your septic system to work properly. K-37 prevents the clogging of inlet and outlets that can lead to unpleasant odors and overflowing receptacles. Easy to use, just pour entire contents into the toilet bowl and flush twice.This half gallon bottle of concentrate treats a 1000 gallon septic tank.