Our private label Fizzy-Pop Ginger Ale has great flavour without the price tag! "2L jug".
Pops are a 5:1 ratio. The colder and more carbonated your water the less syrup you'll use. Start with aprx 125ml or 3-4 pumps for a 1L bottle and adjust +/- from there. Experiment with the number of pumps to find the amount that suits your taste.
Fill the box with 4x 2L and don't forget the syrup pump!