| | Re: CSM+B Iron dose
My city water isn't checked for phosphates. But, if it had more than a trace there wouldn't be that much iron in the water. Iron would precipitate out.
I looked at my supply of CSM+B and it looks like I added enough iron to it years ago to double the iron in the mix (as I vaguely remember it). So, I'm not sure how much iron is in the mix. I just bought a small bottle of Flourish Iron from Amazon to use instead. I'm much more confident that it has a knowable amount of iron.