Hello,

We've got an IG gunite pool, 16'x30', approx. 17000gal. The house was built in 1971, pool has got to be pretty old, the pump sure looks it. We're in central Florida. Here are the numbers:
temp: 86
FC: 13 (had some kids over, so we raised it a bit)
CC: 0
TC: 13
pH: 7.2
Alk: 110
Cal: 470
CYA: 80

Should I be concerned about the calcium? What are the first signs of scaling?

Thanks,
~A