Well, Start Right as far as I know will only remove chloramines and
chlorine. I have a smaller bottle of it, and on the back of it it states to use 10 drops per gallon (but that is as measured by the bottle itself).
As far as Prime I do not use that one, so possibly someone else here can help.
*edited to add*
I have heard that Prime is similar to Amquel+. If that information is correct, then it not only should remove
chloramine and chlorine, but also detox
ammonia,
nitrate and
nitrite. But you'd have to read the product description to be sure.
