content: This product has been excellent for dosing when performing water changes. Subsequent to its use we have found that our corals "bloom" as full as possible and appear to be at their healthiest. Even thought we produce R/O water using a high end filter with four cartridges including resin and deionization, adding this product to the R/O water when performing water changes seems to improve water quality.Also, when I look at my tank and see my corals are not looking as healthy as I would like, adding this product at the recommended doses produces immediate results and within ten minutes we see a substantial improvement in the look of our corals.