I have an in-ground fiberglass pool. I was away for a week and just tested my water. Right now I have 0 chlorine and a pH of slightly higher than 8 (which may explain why my water is cloudy right now). My pool is about 27,000 gallons.

On hand, I have muriatic acid, shock and chlorine tabs. I just finished vacumming the pool to waste (cleaning up some residual algae from the bottom and sides) and am refilling it.

Can I go ahead and adjust both my pH and my chlorine at the same time? Or, do I do one, and than the other?

I need a quick answer so I can start this process as soon as I am done filling.

Thanks.