I had a very similar thing happen. To fix the issue I did several 10% water changes over several days. To the saltwater to be used for the water change, I dropped in enough muriatic acid to bring the ALK down to about 5dKh After aerating this water very well over at least 12-24 hours to raise its pH back up it is safe to use. Just keep track of how much salt and how much muriatic acid you use so it’s easier to repeat consistently for subsequent water changes
It was easy to then plan out how many water changes it would take to get into a safe range. In your case 14dKh x 9 =126. 126 + 5 = 131. 131/10= 13.1 dKH resulting dKH after the water change. Another water change at these values would be 13.1x9=117.9. 117.9 + 5= 122.9. 122.9/10 = 12.29 resulting dKH.
Of course it depends on what dKH you lower it to and if you accurately change 10% etc. But this will get your all down in a safe, controlled way.
It was easy to then plan out how many water changes it would take to get into a safe range. In your case 14dKh x 9 =126. 126 + 5 = 131. 131/10= 13.1 dKH resulting dKH after the water change. Another water change at these values would be 13.1x9=117.9. 117.9 + 5= 122.9. 122.9/10 = 12.29 resulting dKH.
Of course it depends on what dKH you lower it to and if you accurately change 10% etc. But this will get your all down in a safe, controlled way.
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