Great advice, DCBC. I put bleed valves on both of my pump outputs on the new rig. The real problem here is that you still have air in the hose going up to the chiller. Even if you get a smooth prime, you are still going to have some sputtering until the air is completely out of the line. Jamil's advice to hold the whirlpool output out of the wort and slowly crack the valve (after you have the pump head wet), will reduce the spashing.
Mylo

