Are you growing with a layer of vermiculite at the top? It is a good idea to do so, to protect from contamination. The other advantage is getting rid of water. Simply flip the jar over, the water (because of gravity) will go down into the vermiculite layer and should get rid of excess water.------------------
"When you're high you never, ever want to come down"- Welcome to the Jungle, by Guns n' Roses