"Karl Timmermann" wrote in message
...

2.) A 3/4 inch or 1 1/8 inch 12 volt electric water pump (about 800-1000
gallons per hour) that needs to be pretty light. The pump MUST not let ONE
drip of water back through it when off. This means it will act as a check
valve. I had bought one at West Marine, where they told me it didn't let
any
water back, but it does. :-(

If the thing doesn't operate the way they said it's supposed to, then
it's a defective unit and needs to be replaced by the store. It's called
implied merchantability.

Good Luck!
Rich