Hi everyone can any one advise us please on a recent visit to our casa i found 2 dead birds in our cisterna and it was a little smelly probably due to the birds floating in the water is the water safe to use for showers still and also are there any chemicals we could or should add to it to make it safe we do not use it for drinking only showers and washing up etc also what are the risks of catching legionaires from a cisterna the pevious spanish occupants used to drink the water although we would not thanks