Good morning to Poland from Germany, UV will indeed "help" to get water to a drinkable stage. BUT if you are using any type of plastic bottles or bags, do not forget that the BPA content of many plastic stuffs can and will cause impotence. (no more children from your genes). Please, all reading this, do your math and please google:
Jim Humble and read his story about using MMS to clean your water. I am and have been using this chemical process to clean food AND water for many years now. Absolutely NO side-effects. Pissed on by the Pharmaceutical companies, because it works and is cheap!! Make your own decision and your own opinion.
The German Medical Ministry put out a Warning Bulletin on MMS! They said it has a 'lethal dosis' of 262 mg. per kilogram of body weight. OK, a normal mixture of MMS
contains approximately 0,006 mg. of LETHAL DOSIS. (((They did not mention that aspirin has a ld of 162 mg./kg body weight OR that coffein even has only 65 mg./kg.
Your cup of coffee every day, is 4 times more lethal than my MMS))) Live free, GP
PS: in Europe we buy the box of "Aqua-pur" for sterilising our Campertrailer water tank for 18 Euros ($20,00) in the Pharmacy. Same stuff, different name....