The EcoLet 55ai is the latest model in the EcoLet range & includes a digital display. It’s the deluxe model of the EcoLet 25e & is suitable for 3 people full time or 4 people part time use. This composting toilet system is the ideal alternative toilet to a typical ‘plumbed in’ loo. The composting process in an EcoLet toilet occurs naturally in the toilet itself.