Sorry you can't read our scientific proyect, but here you have a summary of the proyect so that you can get an idea of what it is about and how it works: We have created a little machine to help people and make them know if their liquids have or haven’t got any kind of bacteria. The invention works in two ways: One of them is introducing the sensor, at the top of the machine, in a liquid, so as to detect the turbidity in the liquid. If it is different than 5, which is the average level in all the liquids, a light will appear on a screen, red if there are more harmful bacteria, or green if there are more healthy bacteria. Knowing this we could apply the UV rays. These rays are able to dispose the harmful bacteria. Thus, in a few minutes we would have our liquid empty of harmful bacteria. The other way is introducing the sensor in the liquid, which will recognize every single DNA of each bacterium. It will send the information to a data base. This data base will know if the bacteria are better or worse for our health, so it will send back the information to our machine. If the bacteria are bad for us, the red light will switch on and we will have to apply UV rays. If not, if the bacteria are good for us, the green light will switch on and we will not have to apply UV rays.