Keywords
                                    Filter Bed
                                
                                    finer media
                                
                                    source water
                                
                                    robust design
                                
                                    particle size
                                
                                    coarser media
                                
                                    organic matter
                                
                                    reverse osmosis
                                
                                    backwash system
                                
                                    10 to 50 microns
                                
                                    decreasing order
                                
                                    backwashing action
                                
                                    multi-grade Purify
                                
                                    multi-grade filter
                                
                                    treatment processes
                                
                                    operating conditions
                                
                                    industrial processes
                                
                                    ordinary filter media
                                
                                    water treatment plants
                                
                                    high filtration efficiency
                                
                                    wastewater treatment space