I suppose I could send the pump back and get a smaller one. The original pump that was installed was a 1 1\2 hp. I have not purchased any shock treatment yet so I don't know what the ingredients are. My goal was to start working on the pool this weekend. It was raining but I think it just stopped so I'll venture out to the store soon and pick up the items you suggested. The pool test kit is scheduled to arrive sometime today.