What should Calcium Hardness be?

[Sumo1]

Welcome! CH for a gunite pool should be between 200-400ppm so I suspect there's an issue with the way you're testing. I'm sure one or two of the more experienced folks will be along soon to straighten it out. Since this is your first pool season, you've come to the right place.
Hal

[chem geek]

I don't know about the Leslie's test, but I thought it was the same as the Taylor K-2006 which has these instructions. It says to multiply the number of drops by 10 if using the 25 ml sample and to multiply the number of drops by 25 if using the 10 ml sample. So if you used a 25 ml sample, then you would have 120 ppm CH which is still low, but sounds more accurate.

To clear the dead algae you need to keep the chlorine levels high (you didn't give your CYA level, but use the "shock" column in this table as a guide) and should use a skimmer sock (or nylon stocking as you are doing) and vacuum to waste from the bottom of the pool (for settled algae), and brush the sides to help get the algae to the bottom or into the skimmer or filter. You'll need to clean your filter at some point as well. Most important of all is to have patience. See this link for how a pool WILL clear from algae using chlorine alone. Keep the chlorine at shock level until 1) the Free Chlorine level holds overnight and 2) the Combined Chlorine is close to zero (< 0.5 ppm) and 3) the water is clear.

Richard