The Reactive Separating Agent (RSA) takes a wastewater system through each of the treatment steps that a traditionally oriented system would use. The process occurs quickly and sequentially without the need for extra holding tanks or constant supervision. This feat is accomplished by employing the differing solubility rates of each of the ingredients so that they become active at the right time to accomplish the task at hand. The acidic portion goes into the solution first. This results in a reduction of pH in the water and breaks any oil emulsions. Cationic (positively charged) polymers then attract the oil and some of the sparingly soluble negatively charged species such as phosphate or sulfate. The colloidal particles also participate as an absorbent for the oil.