Thanks for the positive thoughts on what we are bringing in
the A and K are the trace elements that are not found in salt mixes or can not be added due to precipitation. They add the final element to the system.
In regards to conversion calculation to be honest there is not one as TM or us have no clue of what type or quality the salts they use are although based on the price I am going to guess at not above food grade.
If you have balance right now and that should be as follows
Ca around 420-430
ALK - 7-8
Mg - 1280 - 1350 (closer to 1350 is better in my oppinion)
If you are within those ranges then initially dose to the same level you are now for 48 hours and then test, from there you will know if you are needing to adjust an element up or down.
If you are not within the ranges above then manually adjust over a week to those levels. Remember the connection between ca and alk the higher the alk the harder it is to raise ca without raising your MG.