Originally Posted by earlybird
I have a water jug that I have a piece of airline tubing and an air control valve that I use to drip water thoughout the day to minimize my top offs. I still need to top off b/c I haven't gotten the drip rate down to a science and I don't think I ever will b/c there are too many factors involved in evaporation. Would love to have an auto top off system but don't have the room.
I use the same method for top offs.
Like you said, evaporation is not constent. And i'm constently adjusting my drips. But it is a cheap method.