Aluminum compounds, when added to water to form floc in a clarifying system, are known as: Power Engineering Chapter 66 Aluminum compounds, when added to water to form floc in a clarifying system, are known as: a. Curdlers b. Congealants c. Coagulants d. Thickeners e. Flocs Answer: C Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+