I could be wrong but I thought I read that 3a+3b did not contain trace elements. If it does not, why use C03 to adjust alkalinity? I would say just use 3a+3b to make adjustments. Or, if it does contain trace elements wouldn't it be correct to use 3a+3b to also raise trace amount that would be deficient because it was being under dosed prior?
Any thoughts?
Any thoughts?