I'm gathering my material list to install a ballast system in my 98 Comp. the plan is to have a 225lb bag under the bow, and a 400 lb bag in the rearmost locker behind the rear seats. I have already weighted it like that and it works great. For surfing I add a 500 lb bag on one side and everyone sits on the rail.

I am planning on using tsunamis for speed and cost. I won't go with reversibles.

Questions:

If I add a vented loop in the fill line, will the bags not suck flat when I empty since the vented loop will just introduce air when I'm emptying?
Can I just run a loop in the line up high instead of running a vented loop? I'm thinking when I empty I'll pull water through the fill pump.
I'm planning on runnin a spring check on the vent so the bags are a little under pressure. Doable or would the water piss out the empty pump or the fill pump when off?


The back bag I'm not too worried on, since the fill line has to go to the front and then the back. The empty line is comin up to the front