Alk calculator????

[TheWorldsOceans]

Say I have a 100 gallon system. my system is at 8.2 alk.
Say I do a 10% water change but the water change mix is 12.0 alk?

How much will this change my alk? What formula do I use to get the answer? Thanks in advance

 

[JimWelsh]

Say I have a 100 gallon system. my system is at 8.2 alk.
Say I do a 10% water change but the water change mix is 12.0 alk?

How much will this change my alk? What formula do I use to get the answer? Thanks in advance

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