Refilling SodaStream Canister from 20 lbs CO2 Tank Now 5 cents per bottle of Sparkling Water

As far as how much it cost to make Soda using our method, here comes the SHORT ANSWER:
- It costs $1.22 to refill a canister ($22 / 18 canisters)
- It costs $0.08 to make a 1-liter soda drink ($1.22 / 15 refills)
- It takes 4 mins to fill up a canister full from a 20 lb tank (the first 10-12th refill).

LONG ANSWER:
Refilling 20 lbs of CO2 = under $22. However the pressure becomes too weak at the last 7 lbs and only able to fill half the 14 oz canister (13 lbs usable). From our experience, we are able to refill 18 Sodastream canisters before we let go the rest of the Co2. Then with 1 canister, we are able to make 15 one-liter soda.

Here is some weight info on a 20 lb tank. we weighted the tank before/after. Empty tank=25lb, Full tank with max Co2=45 lb. There are really 20 lbs of Co2 in the new tank but here comes the problem - The first 10 refills was able to take 1100g (rec max 1280g on the first few can). After the first 10 refills, the refills quickly drop below 1000g. At around the 18th refills, it only takes upto 850g (empty canister=660g). We gave up the rest at that point.

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