Nava Quick-Dissolving Dichlor Shock is commonly used when a quick chlorine dose is required. 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, fiberglass or colored plaster surface pools. Quick-dissolving formula does not require pre-mixing and will not cloud your water or bleach your vinyl liner. It is also pH-neutral, so it will not affect pH levels, cutting down on the expense of balancing chemicals. Super strong 56 Available Chlorine. 99 Sodium Dichloro-S-Triazinetrione.