Leave CH alone, too. Sounds like you took your water sample, added the blue dye, then added the reagent and the water turned clear. I'm guessing your kit says 2 drops means 20ppm of calcium. Anything from 0 to 500 in a vinyl pool is FINE! So you don't have to worry about it--if you want to chlorinate with Cal-Hypo, you can without fear of raising Calcium too high for a long, long time.

If you can find the older plastic-wrapped cal-hypo tabs, the 68% ones, you can use them when you travel. Instead of the skimmer, buy a new adjustable floater (get a different style from one you use for tri-chlor pucks. I use blue for tri-chlor and a green one with a frog on top for cal-hypo) and use that. Be sure to use a NEW one--putting cal-hypo in a floater that had tri-chlor in it is VERY dangerous.

Then again, all I do is have someone dump in a gallon of regular bleach every other day that I'm gone--cheap enough, easy as pie, and works LIKE A CHARM. You come home, even after 2 weeks, to a perfect pool.