To fill stick a hose over the side facing horizontally towards the bow, the boat moving forward should force water into the sacs (you may have to vent the sacs somehow). To drain I would have stuck the pipe in the water straight down or angled slightly towards the stern and let the Venturi effect create the siphon... That or run them horizontally towards the bow (filling) for a few seconds then just hang the pipe over the side and most of the water should siphon out. Down side to this is usually someone has to get wet, unless you built a more permanent system, but pumps aren't really that expensive. A 1200 gph pump doesn't really pump as fast as it suggests, you will always have some loss somewhere. The fill/drain rate also depends on the size of the plumbing you are using. It's hard to say as I don't have that pump or that much ballast to drain, but I would bet at least 20 minutes.
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