Do you have steel (iron) pipes? (IMPORTANT QUESTION: Find out, if you don't know.)

Regardless, report your test results, ASAP, when you get your K2006 . . . AND do all these things:

1. Run your filter 24/7 -- on low if you have a 2 speed.
2. Add borax (20 Mule Team Borax from Walmart, etc.) 2 boxes at a time, to the skimmer. Do not CHOKE the skimmer. Test pH 4 hours later. As soon as you see the slightest pH increase, drop to 1 box at time. Stop when the pH reaches 7.2 - 7.4
3. Get some polyquat (info) ASAp and use it.
4. Maintain chlorine levels but do NOT add a large amount of chlorine at once.

Looked up KH => carbonate hardness. It's relevant info, but not in isolation.