So glad you are going to get the K2006! You will be very happy you did!

I also have an auto-cover and try to only add water when we get rain. I have a tub of dichlor which adds CYA when I need it. The CYA seems to show up in tests pretty quick and I really like it for that reason. If it were me, I wouldn't invest in more Tri-Chlor at this point. Some people use it when they go on vacation or for start-up should their CYA be low then. DiChlor and bleach has worked for me. Never used Tri-Chlor.