Pool Care Cal Hypo Shock, 1 Lb. Bag, QPC55127
Cal-Hypo Shock is made up of 68% available Calcium Hypo chloride. Cal-Hypo Shock treatment has been specially formulated to rapidly destroy algae, slime and unpleasant odors. It is recommended for use as periodic shock treatment or super chlorination to sanitize and control algae growth.
Turn on filter. Adjust pH to range 7.2 to 7.6 prior to using Cal-Hypo treatment. At night or when pool is not in use add 1 pound if Cal-Hypo Shock per 10,000 gallons of pool water by sprinkling it over a wide area of pool surface.
When I couldn't find my go to brand in store or online, I tried this. It worked fine and seemed to be similar to the name brands.