1. The granular polyacrylamide flocculant cannot be directly added to the sewage, and it must be dissolved in water before use, and its aqueous solution must be used to treat the sewage. 
　　
2. The water that dissolves the granular polymer should be clean (such as tap water), not sewage. Water at room temperature is enough, generally does not need to be heated, the water temperature is not higher than 60 degrees, not less than 5 °C. 
　　
3. The selection of polymer solution concentration is 0.1%-0.2%, that is, 0.1g-0.2g of polymer powder is added to 1 liter of water.