I've seen quite a bit in Ron's web pages reference timers for turning pumps on and off. Check out
X10.com - Security Cameras, X10 Home Security, Wireless Camera, Home Automation, Electronics and More! it has a product called Active Home that you can easily program your whole house (including pumps) to turn on/off whenever and as many times as you want according to the documentation. The application runs on a PC and once set up, you supposedly can turn your PC off and the scheduler still operates. I haven't tried it yet, however it looks very interesting. Tim