I don't have a Hanna Low Res Phosphate Colorimeter. I wish I did.
When I tried Rowaphos for the first I knew (visually) that something was happening within the first few hours. (There's an old post somewhere on RC by me.)
I wish somebody would test some PURA Phoslock and perhaps some Rowaphos and post the different results.
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over 24 years experience with multiple types of marine aquarium systems
*see Upstate Reef Society Forum on RC and FB* GOOGLE JUNIOR'S REEF
Current Tank Info: 84x24x30 265g reef past TOTM honors
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