Different products have different instructions and react differently.
I don't understand the bubbling thing that you are asking. I assume you must have used some other products before and *that* product introduces "foaming" in the water. If their contents were the same, then there wouldn't be different brands right?
As an example, a very small bottle of 118ml of Genesis actually treats 2000 gallons. Seachme Prime 500ml that treats 5000 gallons. By comparison, 1ml of Genesis treats 17 gallons and 1ml of Seachem Prime treats 10 gallons. So obviously, different products have different instructions.
Nothing to worry about.
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