Zep Septi-Pak ZSTP2 Septic System Treatment, 4 oz Pouch

Septi-Pak concentrated septic treatment is a biodegradable formula that degrades and digests waste. It replenishes the essential bacteria that break down fats, oils, grease and organic waste. The easy-to-use concentrated formula is safe for pipes. Use one pre-measured bag once every two months for a 500 gal tank.