The Planted Tank Forum - View Single Post - Safe T Sorb lowered GH but not KH?
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Old 02-03-2013, 04:14 PM   #5
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STS works very fast to remove KH.
Tap: about 4 degrees KH.
Tank (88 gallon tank) with STS (40 lbs, new) hits zero in just a couple of days.
When I add baking soda to restore the KH to about 3-4 degrees it again hits zero in just a few days.
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