From Newsgroup: rec.autos.tech
Aha! I had the same problem when replacing my old SodaStream with a 5lb tank.
Here's the secret: SodaStream has a spinner which froths the CO2 into the water. Look up and inside.
I haven't figured out how to replicate that yet. Might try a faucet aerator if I can figure out how to connect it.
In the meantime, really cold water and a bunch of shaking (like 60s) while bubbles are still coming into the bottle works fine. I have to invert the bottle to tell when bubble are still coming in.
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