The EASYmaxx water balloon factory – summer, sun and fun times 88. The EASYmaxx water balloon factory can fill 88 water balloons simultaneously. Once the balloons are completely filled, their own weight causes them to drop from the hose and they self-seal through their sealing rings. No need to tie the balloons. As the water balloon factory consists of individual 4 adapters with 22 filling hoses each, fewer balloons can be filled, if necessary.