ALk is really high

[Skimmerking]

Well I tested my Alk in the 20 gal tub that I have been using for the top off and it was sitting at READY FOR THIS 39.6DKH. Im not a smartie pants ,but that does seem really high doesn't it now I'm really confused. When Doug was testing the water when I was gone it, wouldnt come up past 8 DKH and now once I got home its sky rocketed. All I did was add 4 TSP to the 20 gal tub. Now tell me that it didnt make it sky rocket that much would it.

What is the proper dose for Pickling lime to 1 gal of RO/DI i have checked my tDs and the water is good and 2 days ago the tank was at 14.6 ALK and the CAL was at 450PPm. should I wait to see what happens or try another route with the pickling Lime.

I thought that 1 TSP of PL for 1 gal of RO/DI water was the direction given on the net.