Re: Newbie Guide to PPS-Pro
They are not the same but if you are worried about iron, 1.2 ml of Flourish is equal to 0.06 gm of CSM +B, maybe.
The actual amount of iron in your tank water will be effected by the chelating agents in each; so, the only way you could tell for sure is by testing for iron.
Anyway, if you follow the label directions on the Flourish, you should be OK for iron.