Lowering TA involves lowering the pH to about 7, then aerating the water with a fountain or by pointing the returns at the surface of the water to outgass the carbon as carbon dioxide. As you aerate, your pH will climb, so you'll have to add acid to keep it down. Check your alkalinity at the same pH everytime so you don't get mislead. Go to the alkalinity forum and read the sticky there for more info.
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