Clearview Shimmer-N' Shock Granular Pool Shock, 99% Sodium Dichlor, 1 lb Pouch, CVDB001

Clearview Shimmer-N' Shock, part CVDB001, is a 1 lb pouch of granular pool shock made from 99% sodium dichlor with 55% available chlorine, used to super chlorinate swimming pools, including vinyl lined and above ground pools, against bacteria and algae.

What it does

Sodium dichlor is a fast dissolving, stabilized form of chlorine. Shimmer-N' Shock goes straight into the pool without pre-dissolving, dissolves completely without residue, and Clearview says it does not cause pH bounce. Shock with it when the water turns hazy, after heavy rain, in very hot weather or after a lot of swimmers, or use smaller doses to hold free chlorine between 1 and 3 ppm.

How much to use

Each ounce adds about 0.4 ppm of chlorine to 10,000 gallons. For a shock the directions call for 14 oz per 10,000 gallons, about 6 ppm. At start up, 10 oz per 10,000 gallons raises free chlorine about 4 ppm, and a 5 oz maintenance dose raises it about 2 ppm. Balance the water first, with pH at 7.2 to 7.6 and total alkalinity of at least 125 ppm.

Before you use it

Add it in the evening with the filter running, broadcast over a wide area of the deep end, and brush out any granules that settle. Keep swimmers out until chlorine falls below 4 ppm. Dichlor breaks down into cyanuric acid as well as chlorine, so regular use raises stabilizer and is worth testing for. Store the pouch cool and dry, away from acids and other chemicals, and never let water get into an opened container.