Say Goodbye to Smelly Pit Latrines & Septic Tanks Biotoilet: Bad smell control for Pit latrines & Septic tanks.For KES. 5,200.00, Get rid of SMELL in outdoor Toilets & Septic tanks with Ecocycle Biotoilet solution. “If it’s, for example, one pit latrine that serves about 5–20 people per day, the dosage is 1 kg once every 6 months. So, in a year, you dose twice.”