On Alibaba chat , pakistan customer inquired industrial water filtration automatic self cleaning filter , in the beginning , client told that will be used in their dyehouse wastewater treatment and recovery plant. And before the Ultrafiltration unit of the plant to reduce the TSS from 80 ppm to < 7 ppm, discussed with our tech engineer , recommended quartz sand filter + precision filter ,  Quartz sand is used to reduce suspended solids and turbidity, and the precision filter is used to protect ultrafiltration. But first time this solution is rejected by our customer , he said that only need precision filter , becasue in Pakistan market , most dyehouse plant used double precision filter in series , is enough . Then talk with him , about required spec , flow rate 30m³/h , connection size DN80 , filter element material must be SS316L , because their water is very corrosive- 5,000 TDS mostly sodium chloride. shell material SS304 , filter micron 100μm ， After repeated confirmation, the quotation is modified one time at a time. My customer explained that they wanna self filtration , self clean and wash , so updated new solution , self cleaning filter , inner ss316l filter element , confirmed 380v,50hz , voltage applicable to their country . I think it was time and again that I took the trouble to help the customer update the scheme and explain the questions. The customer finally picked two sets from us for trial use. Thank him very much for his trust. I will strictly follow factory this production , hope they will be satisfied .