NAVA 1301-06 Chlorinating Shock Bag44; Dichlor Nava Quick-dissolving Dichlor Shock is commonly used when a quick chlorine dose is required prior to Customers find this product is very easy to use for routine shocking throughout the pool season Kills algae and will rid your pool of unsightly algae spots Ideal for use in vinyl-lined&#44; fiberglass or colored plaster surface pools Quick-dissolving formula does not require pre-mixing and will not cloud your water or bleach your vinyl