ProE-Vac Liquid Evacuation System Cleaner, 1 oz. Unit Dose Tubes, 24/Box. Non-foaming biodegradable evacuation system cleaner leaves a fresh mint scent. Cleans and deodorizes the entire evacuation system. Regular use keeps tubing and pumps free-flowing. Low pH ensures complete penetration through soil, yet is gentle to the evacuation system. 24 - 1 ounce unidoses