I've got about 40 gallons of water that needs to be rotated out (my first rotation since starting to stock). Anything from 6 months to 1 year is going, but I can't just dump it down the drain. What do you guys think would be the best way to use it? It's winter time here now and altho it's been a warm winter I know freezing temps are gonna make a come-back before spring, so I don't want to use it to re-fill the rain barrels. What other ideas would be good?