Adding calcium to new fiberglass pool?

[JenfromNC]

Brand new fiberglass pool. Calcium is testing at 100 from whatever chlorine treatments the PB was dumping in it before I took over. I haven't added anything with calcium myself yet.

Do I need to add calcium beyond that 100 that's in it? I know it says recommended level is 220 for fiberglass, but do I need that NOW or should I just let it build over time with the occasional chlorine puck? (the pucks DO have calcium? or is just CYA the pucks add? They dropped off pucks in a clear baggie so I can't check what the heck is in what I have)

 

[mknauss]

Most fiberglass manufacturers do recommend a CH of 200 to keep from staining.
The pucks add chlorine and CYA to your water. For calcium, you would use Calcium Hypochlorite. Normally granular and called 'Shock'.

 

[JenfromNC]

Shock is chlorine, right? So adding shock to get the calcium up instead of liquid chlorine for that time period? Or am I just dumping a ton in to get it up and letting it burn off?

I need to go read don't i. Sigh

 

[mknauss]

You can use cal hypo in place of liquid chlorine to raise your CH. It will take some time, but with a FG pool it is not urgent.
Just be sure the cal hypo granules are fully dissolved. If they rest on the pool surface, they could stain or create small scale bumps.