SODIS: An Easy and Inexpensive Way to Sterilize Water
One of the easiest methods to sterilize water is to use the sun. SODIS stands for Solar Water Disinfection. Get ready for how easy this is.
Fill plastic bottles with the water to be sterilized. Clear plastic is what you need. They also need to be PET bottles. Just look on the bottom of the bottles you have, if they are clear and say PET on them they will work. Don’t use those gallon milk jugs that are opaque.
Here are the steps:
- Find a food safe plastic bottle. 2 liter bottles work great. Remove all labels–this will allow the sun to hit more surface area on the bottle.
- Get your bottle and fill it about 2/3 to 3/4 full of water to be disinfected.
- It is best to use as clear of water as possible. One way to get it clear is to filter it through a simple sand filter.
- Put lid on bottle and shake your bottle for about one minute to get as much oxygen dissolved into your water as possible.
- Open your bottle and fill it the rest of the way.
- Set your bottle in the direct sunlight. If possible, set it on something dark. The darker the better. But not grass. Lots of people use roof tiles or tinfoil. You want the surface the bottles are on to be as reflective as possible. It is best to lay the bottles on their sides. If you are using 2 liter bottles, just lay them down. It allows the sunlight to hit more area within the bottle.
- Leave your bottle in direct sunlight for at least 6 hours, but if possible even longer.
- If the weather is cloudy or overcast, set your bottles out for two days in a row.
- Voila. Your water is now drinkable.
Easy. Simple. And best of all, basically free. One thing to remember is the SODIS method will not remove chemical pollutants. If your water has chemicals in it to begin with, it will still have them after you use SODIS. So make sure your water source is chemical free to begin with.Tags: clean water, purify water, sterilize water, water