Hey i know there are alot of doser projects on here, but i just wanted to share my story. I used a gallon windshield washer container, cleaned out. Then drill a hole in the top of the cap. Drop a ridged tube to the bottom of the container, connect some air line tubing and a stopcock valve at the end. Then use a syringe, 10 cc should do it. You can get this from a drugstore or hospital, and siphon out the air in the tube. Sit the gallon container on a shelf and drip the meds in to the sump. I have mine going at about one drip per second. There you go now you dont have to pay 20 bucks for a doser