Polarshield - Pool Protector 20 Winter Closing Chemical Kit (up to 20,000 Gallons)

Polarshield Pool Protector 20 Winter Closing Chemical Kit (up to 20,000 Gallons) contains 2 lbs of Sodium Di-Chlor shock and 1 qt of Algaecide 50. Establish a chlorine residual with the Di-chlor shock and maintain algae with the Algaecide 50. The Di-Chlor should be added directly to the pool around the perimeter with the circulation system running. Wait 3-4 hours then add the appropriate amount of the algaecide 50 per the water volume. Retest water balance in 24 hours. If chlorine level drops repeat with additional shock to meet chlorine residual.