After using a 540lbs bag in the walkthrough to the bow and filling/draining it with the wakemakers 1700gpm tsunami pump ... I wanted the whole thing hidden and being able to use the standard pumps ...

So after checking where the current double pumps are and where I could tie into - here’s the design.

T inserted after rear top pump (pump is inside rear locker behind a carpeted panel - easy access) and bringing hose to the midship storage areas. T inserted in the vent lines coming out next to battery switch in the left (or trash bin in the right). Forgot vent valve at first so bags were draining but once empty the factory ballast wasn’t as it was pulling in air ... should have seen this coming.

I used 1 1/8 tubing ... thought that Supra was using that too but that wasn’t the case and as I bought all fittings for that size I just heated up the factory tubing so I could install my fittings. One thing I wanted to accomplish was that I can remove/disconnect everything if I needed to. So the T fittings are flow-rite connectors - so if I want to remove the whole thing I just use a connector to put 2 end hoses together and system is back to original.

Bought everything from flow-rite.com except the one way vent valves (wakemakers.com) and the bags (the-house.com or amazon). Flow rite is cheaper as they make the stuff and they ship really fast - got my stuff within 2 days each time. Why I didn’t go with a larger ballast bag is simple - I wanted to have it all underneath without being pinched against hinges or rubbing on fiberglass. I’m not using the entire depth of the storage compartment nor it’s length - however under each corner seat cushion I still have storage left. So the entire system is now filling and draining for the same amount of time as the front ballast before - just below 8 minutes or so. As said in the 2019 thread if I have 6 adults in the boat and they mostly sit in the back the system is passively draining but only from the added bags. Not sure if one of the impellers is shot but when trying to replace the lower ones I realized that I need to take out the floor panel above the gas tank as I don’t have enough access to the lower pumps ... so 8 save that for another day. Cost overall is about 350 for all of it - will be cheaper if you just plump it in without the removable fittings obviously.