Robelle 5-In-1 Swimming Pool Multi-Purpose 3" Chlorinating Tabs contain a proprietary blend of ingredients that will reduce the amount of pool chemicals needed to keep your swimming pool clean. Each 3" 8 oz. tab is individually wrapped for easier and safer handling, stabilized to prevent burn-off, and are slow dissolving to maintain a proper free chlorine level. Built-in clarifier produces crystal-clear water. Stain-inhibitor prevents and removes stains caused by metals and minerals. Includes algae preventer that will leave a algaecide residual to help get rid of algae and prevent it from coming back. Built-in descaler will prevent the build up of scale which can cause corrosion. Because your sanitizer has these additional chemicals built in, you will spend less money on pool supplies. For use in feeders or floaters - kills bacteria and controls algae, clarifies, prevents metal staining and corrosion, and reduces scale formation. Important notes: Shock your pool every week and also after heavy rain or heavy use to help keep your pool water properly maintained. Sunlight, rainfall, temperature, number of swimmers and frequency of pool use affect the rate of chlorine residual loss. Adjust cleaning and chemical maintenance accordingly. Use this product in an automatic feeder or floater designed for this product. Do not add other chemicals into the feeder or floater where this product is in use as a fire or explosion may occur. To avoid damage to pool surface or materials do not allow product to come in direct contact with these materials. Do not throw tablets directly into pool. Before using this product ensure all pool equipment is working properly. Adjust stabilizer levels to 40-100 ppm with a Stabilizer. Test the waters pH, alkalinity, and calcium hardness and adjust to the correct level. Adjust pH to 7.4 - 7.6. Be sure to follow label directions when using other products as outlined in directions for this product. Check the free available chlorine level and adjust to 2-4 ppm by adding a granular chlorinating product. Start up and initial treatment directions: If water is cloudy or green, super-chlorinate pool with appropriate shock product until pool is clear. Add 16 ounces of this product (two tablets) per 10,000 gallons of pool water to feeder or floater and then test for the free available chlorine level (allow water to circulate at least 4 hours before testing). Adjust the feeder or floater following manufacturer?s instructions to establish a free available chlorine level between 2-4 ppm. When free available chlorine level is adjusted to 2-4 ppm, add an algaecide appropriate to your needs. For routine maintenance: Add 16 ounces of this product per 10,000 gallons of pool water per week, or as often as needed, to the feeder or floater to maintain a constant free available chlorine level of 2-4 ppm. Sunlight, rainfall, temperature, number of swimmers and frequency of pool use affect the rate of chlorine residual loss so check the feeder or floater often and refill as needed. Robelle 5-In-1 Swimming Pool Multi-Purpose 3" Chlorinating Tabs will kill bacteria, control algae, clarify water, prevent metal staining and corrosion, and reduce scale formation.