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geez thats rediculous!This is information from BRS
This shows the surface area:
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This helps understand how much surface area is actually available (deep within the rock)
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So for example while the Pukani and Reef Saver have the same surface area, the porosity of the Pukani makes that surface area more available to water. You can run water through MarinePure it is so available.
This is the whole thing




