Pump, compressor or mouth...

If you need more than 10 units of balloons for your festival, you will not be able to manage without pump for balloons. Single-sided pump is a cheap alternative. You can inflate 20-50 units of balloons with it easily. But if you want to save your time and energy, choose double-sided pump. You will be able to inflate which ever balloon you want twice as fast as using a single-sided pump.  If you do not want to trouble yourself, choose a compressor to inflate the balloons. It is the fastest method to inflate the unlimited number of balloons within the maximum short time. Using an elementary compressor, you can inflate approximately 200-300 units of balloons per hour.  Compressors are little yet noisy and expensive, but if you acquire such a device, You will be able to inflate all the inflatable toys and mattresses at home.

It is not recommended inflating balloon with mouth, because cracked balloon can injure the eyes. There are few cases recorded in the world when people, who were inflating the balloons, got their eye retina cracked because of exploding balloon.