Hey folks. So i've got about 100ltrs of pure water in plastic barrels that I'm not going to get through for a few days - am worried about it 'going off' as it has no chlorine etc in it to keep it clean Would adding a few drops of bleach to each barrell do this for me? Stop bugs and mould or whatever from growing in it and keep it pure? Might have the added effect of killing mould and bugs on my customers windows? Any thoughts?