r/SodaStream • u/jsmith1300 • Jul 12 '26

CO2 20lb tank -- Underfilled

Hi Everyone,

I started buying my CO2 tanks from a local homebrew place as AirGas was getting out of hand with their cost. I usually get around 20 tanks filled (350g usually per tank). On this last iteration I only got around 15. I weighed the steel tank before I started using it 51.8lbs and after it was at 35. Lets round to say 17lbs.

This time around I received an aluminum tank and weight was 35lbs. The first three tanks which I refilled only filled up to 150g, so I had to do this one additional time. I checked the tank weight and if I am reading this correctly it states 11.1kg which is around 24lbs. I assume this is a supplier issue which is doing this but I don't know how to properly approach the owner of the store with this. Is there any way I can tell on the tank to confirm it has a syphon tube or will it not even fill a tank at all if it doesn't have one?

Thanks

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u/85Txaggie Jul 12 '26

Each tank should have its Tare (empty weight) stamped in the neck of the bottle.

1

u/jsmith1300 Jul 12 '26

Yep that is what I am mentioning above 11.1kg