The objective of this work is to simulate pretreatment steps on a laboratory scale with the purpose of producing a higher quality permeate for feed reverse osmosis process. Pretreatment steps involved in this work are a combination of physical and chemical processes. such as coagulation-flocculation. sand filtration. https://www.spidertattooz.com/Color-Club-Nail-Lacquer-Pure-Energy-0-5-oz-p9629/