In reality, solar water disinfection (SODIS) really is a good fit for equatorial countries with abundant strong sunlight and few other resources. This water treatment method simply uses the sun’s energy for disinfection. The most common technique is to expose plastic bottles full of contaminated water to the sun for a minimum of one day. The sun’s abundant UV light kills or damages almost all biological hazards in the water. The advantages to this way of treating water are plentiful. It’s easy; it’s inexpensive or free; it offers good (but not complete or guaranteed) bacterial and viral disinfection. Furthermore, the method uses no dangerous chemicals and it does not require constant attention.