BUBBLE REFILL - Our 10x Super Concentrate mix offers the best value for money of any of our mixes, it is convenient as you just need to add water, and by making it concentrate we're cutting shipping costs, and reducing carbon in shipping! 100ml = Makes 1L Super Strong Solution - We believe that no solution comes close to ours. The size, length, longevity, and colors are excellent! These are highly engineered with years of research in every bottle. Why we?re the Best? - We?re much more eco-friendly than other makes as our non-toxic Bubble mix is fully biodegradable and contains no phosphates so it?s better for the environment and for children!