Guys,
I've had a fair few PM's asking me to show/explain how my portable Tuna Tube setup works. So here it is.
This pic is of the prototype, I've refined it a fair bit since. The funnels were just put in so I could gauge the water flow from the pump, once I was happy with the flow rate I replaced them with 2 litre coke bottles. I inverted the bottles & cut the bottom off & they worked really well, except they had to be replaced approx every two trips as the Frigates would basically destroy the bottles with all their thrashing. I now use pvc pipe with a threaded top that I can completely close with a lid. I've installed a tap & valve in the top & bottom of each pipe that I connected return lines to, I can also isolate a tube if I fail to catch four baits. You can see me in the background adding water to the bucket, which worked as a crude sump. This is now an enclosed container mounted to the bottom of the frame. It fits in my pack really well is is so much easier than carrying buckets. I always keep a roll of duct tape in my pack just in case she springs a leak, which happens from time to time.