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The clay will slow the build-up of nitrate. Clays have the ability to capture cations, including cations of substances we consider pollutants. Ammonium cations are adsorbed onto the surface of the clay crystal. With less ammonia available for nitrification, nitrate formation slows; and without as much ammonia available, algae will consume nitrate, further contributing to stabilizing nitrate levels. ..... It gets rather complex, so I'll not bore everybody talking "dirt". Just remember, clay purifies temporarily. Eventually, that adheres to the clay will be released back into the water... whether in hours, weeks or eons, depending on all the circumstances.
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