The only problem is:
This tap water conditioner instantly neutralizes chlorine, which is toxic to fish. Either chlorine or chloramines will be present in water provided from public water supplies. This neutralizes only chlorine. Made in USA. Not FDA-approved. Use as little as one drop per gallon of water; one ounce for 587.5 gallons; one cup for 4,700 gallons.
Prime removes chlorine, chloramine, and detoxifies ammonia. Not the same thing.
It says use as little as 1 drop per gallon. Normal municipal water supplies treated with only chlorine would most likely need 2 or more in my opinion.