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Using KH test kit by Aquariumpharm( www.aquariumpharm.com )
As indicate in the test kit that
" The Carbonate Hardness value is determinedby the number of drops of the reagent that must be added to turn the water in the test tube bright yellow. Each drop is equal to 1* dkh or 17.9ppm KH."
So when i tested the water, by the 3-4th drop the water turn from blue to yellow. So i assume to be 3-4dKH.
Not likely, if anything the tap water would usually make the alk slightly higher dpending on hardness. Test the tap water after you add the dechlorinator for ph/alk and then again 24 hrs after adding the saltmix.