Here is our reading from the pool store, we have a fiberglass pool.

TC = 5
FC = 5
Ph = 7
TA = 25
Calcium hardness 185
CYA 80
total dissolved solids = 600

This is the plan from the pool store-

Add 16 oz of metal control to stop staining - wait 24 hours

then add 7 lbs of total Alkalinity increaser (sodium hydrogen corbonate)
wait 24 hours

Then add Calcium Hardness Increaser 10 lbs one day and 10 pounds next day.

We've had the pool for one year and last year the chemicals stayed good. So I have never added metal control or calcium. Since we have a fiberglass pool do we need to add calcium? So I'm not sure if this is right, can I get some advice please.

Thanks