Helium/ Balloongas

Example of calculation of required helium:
A 3 meters balloon has 14m³ volume (Product description). The balloon should last 1 week. The filling of a large helium bottle is approximately 9,1m³.

First filling
14m³ volume: 9,1m³ = 1.53 (ie 2 large bottles)

Refilling-reserve
5% Reserve / day of 14 = 0,7m³ per day
0,7m³ per day. 7 days = 4.9 m³ (Nachfüllhelium for 7 days)

Rather order generously. We accredit Unopened bottles.