A helpful tidbit for those who have container water gardens.

 If you add some crushed charcoal (aquarium type) to your water this will help maintain fresh and clear water.  For example, if you have a 10-14 inch container you would use 1 to 2 tablespoons of crushed charcoal.  You would put this in the bottom of your container and top it with a layer of pebbles or river stones and then fill with water.