YUNDA FILTER is the NO.1 Chinese Water Filters Factory, ISO9001 and ISO14001 certified. We produced and sold over 32,000,000 all kinds of water filter cartridges in 2017. All the parts are manufactured by ourselves. All the water filters are made in the dust-free workshops and under 3-stage QC procedures. We have professional production procedures and strict quality control.We have full of confidence to meet your quality level . We have professional production line and stuff who is making nice quality in short time and inspect our products before shipping them out.