adding on to factory ballast system

[pickle311]

I have an 05 Outback with the factory ballast underneath the rear seat. I want to put a bigger sac in place of that one and put 2 200lb sacs under the seats in the bow. The problem is I want to tie them into the factory system but I need a diagram of it. I don't know what hoses go where and where I can tee them to the new sacs. Does the factory pump run in reverse to empty them, or do I have 2 pumps? and for the overflow, does that just work off of pressure?
Any help would be appreciated.
Thanks

[Yellowmobius]

Run a search for ballast. there have been many topics covering the issue.

[OnTheH20]

Do you have just the one bag system now?