Robelle Concentrated Chlorinating Granules are a super-concentrated, residue-free and fast-dissolving granular. Customers love this product because it is effective and easy to use. Robelle Concentrated Chlorinating Granules will kill algae and rid your pool of unsightly algae spots. Ideal for use in vinyl lined, fiberglass or colored plaster surface pools. This product is calcium-free, so there's no need to worry about clouding. Great for use in spas, hot tubs and swimming pools. Cannot be used in a chlorinator. Directions for application: Broadcast the product evenly over a wide area in the deepest part of the pool with water circulating. This product can be used as a routine chlorine sanitizer. Directions for routine chlorine sanitizer: Throughout the pool season, adjust pH to 7.2-7.6 with a pH increaser or pH decreaser. Follow label directions. Broadcast 3 oz. of this product per 10,000 gallons pool water every other day or as often as needed to maintain chlorine residual at 2-4 ppm. This quantity may vary depending on bather load, temperature and other conditions. Re-entry into treated pools is prohibited above levels of 3 ppm chlorine. As a preventative treatment, you should shock treat weekly to prevent pool problems which may occur when bathing loads are high, water appears hazy or dull, unpleasant odors or eye irritation occur, after heavy wind and rain storms, when temperatures are high, in case of colored water, or if algae develops with resulting green color and slimy feeling. This product can also be used as a shock treatment. Directions for using this product as a shock treatment: Adjust pH to 7.2 to 7.4 with a pH increaser or pH decreaser. Follow label directions. Directions for Start-Up or Initial Shocking: With pump running and pool not in use, broadcast 1 pound of this product per 10,000 gallons of water directly into the deep end of the pool. To prevent possible damage to pool surface, use a pool brush to disperse any granules that may have settled at the bottom of the pool. Repeat procedure after 24 hours if needed, to establish a chlorine residual of 2-4 ppm as determined by a test kit. Directions for For Routine Shocking: Every two weeks with pump running and pool not in use, broadcast 1 pound of this product per 10,000 gallons of water directly into the deep end of the pool. To prevent possible damage to pool surface use a pool brush to disperse any granules that may have settled at the bottom of the pool. Note: Re-entry into treated pools is prohibited above levels of 3 ppm chlorine. Using this product to open your pool: Adjust pH to 7.2 to 7.6 with pH increaser or pH decreaser. Follow label directions. Shock treat following directions above. The next day, stabilize your pool. Follow label directions. As an alternative, three shock treatment dosages with this product will raise your stabilizer level by approximately 20 ppm, which is the normal starting level of stabilizer. Using this product for winterization: While the water is still clear and clean, prepare for long periods of disuse by gradually adding 36 ounces of this product per 10,000 gallons of water (to provide a dosage of 15 ppm free available chlorine). Follow Method of Application above. Run pump and filter until completely dispersed. Cover the pool with a plastic pool cover and prepare the heater, pump and filter components for for winterizing by following manufacturer's directions. Notes on water balance: To provide optimum product performance, swimmer comfort and crystal clear water, always maintain pH in the 7.2-7.8 range, total alkalinity in the 90-125 parts per million(ppm) range and calcium hardness above 200 ppm. Use a reliable test kit that measures all these ranges. Make necessary adjustments with the appropriate pool care products. Active ingredient: 99% Sodium Dichloro-S-Triazinetrione; provides 56% available stabilized chlorine.