Mariam owns and operates Mulongo's Restauran in Kampala, Uganda's capital. By using improved cookstoves to cook for her clients, Mariam only uses one sack of charcoal for ten days which is very low compared to her colleagues’ who own the same size restaurants. She invests the savings from her charcoal purchases to grow her business. Mariam appreciates the fact that the stove manufacturer repairs her stoves at a very low price whenever they become damaged, which means she can use them for a very long period of time. She's had her improved stoves for over 5 years!