One thing that's always annoyed me is the time it takes to transfer water. So I decided to upgrade our setup.
External Pump, 2 inch hose and it will do 398L a min. Very short hose and gravity fed.
Should stop traffic jams at mine in the morning if a few vans turn up at the same time.
Wish I would have done it sooner. 650 Grippatank filled in less than 2 minutes now