best way to lower high alkalinity

A buffer will raise your alkilinity.....time is the best way.....How high is it???

If its less tha 12 or 13 let it come down on its own...if its much higher than that do a 20 or 30 percent water change then monitor it......
 
time, in a week it will be back to normal, if you have a-lot of corals, they will use it up quick.
 
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