Helium instructions

[jizz676]

I read how to make the exit bag in the pph....I want to know if this tank is good..
https://www.amazon.it/Balloon-Time-palloncini-gonfiare-palloncini/dp/B0133ZKBDO#
made in europe...250 liters...0.25 m3 helium
standard helium tank
you can enlarge the image

 

[jizz676]

0.42 m3 I found too

 

[Delaying]

I read somewhere that Balloon Time tanks now contain 20% normal air so they are no good any more for exit bags.

 

[jizz676]

https://www.amazon.it/eliumStar-Bom...words=elio&dpPl=1&dpID=51tQi1MQ7hL&ref=plSrch

420l 0.43m3

 

[jizz676]

I read somewhere that Balloon Time tanks now contain 20% normal air so they are no good any more for exit bags.

where can i buy pure helium? if its needed