I also left out the hardness test. I haven't done that one yet, so it wasn't front of mind.

Hardness (Calcium) - Add pool water to the 25 mL level in the largest tube. Add 5 drops of the blue capped bottle marked "Hardness Indicator" and swirl to mix. It should turn red if there is any hardness. Then add the titrant (the other blue capped bottle) and swirl after each drop. When it turns blue, count the drops you used and multiply by 10 - this is your calcium reading.