I have enjoyed the pool school and am searching for the exact information for spas? Does that exist on this site? For example, is there a spa calculator that tells you exactly what to add to the spa based on test results? What are the recomended levels for the different readings (ph, alkalinity, etc.)? What chemicals are recommended to be used? I am great at following instructions I am just searching for the instructions. Thank you, in advance, for helping a new spa owner.