clean water?

[pressthebutton]

why did my ro water sitting in my new tank(while i work on sump for a week)develop a film and slightly cloudy water?

 

[Tang Salad]

Possibly dust from the room settling on it. Was it covered?

 

[pressthebutton]

no, but what made the water cloudy? would the dust get in there? all i can think of is that the old dried up calcium in there is releasing a fine calcium powder.