Here is pelican's Opening Bundle for Initial shocking and balancing of your swimming pool.
The Pool Opening Kit includes:
20lbs of Chlorine slow dissolving Tablets
10lbs of Alkalinity Booster
12lbs of pH Increaser
10lbs of pH Decreaser
2 Bottles of 32.oz Black Algaecide
4 lbs of Bagged Clorine Shock!