NSA stopped manufacturing and marketing its water filter product line in 2007. Carbon nanotubes have gained much attention for its use as wastewater and water filter. The Specialty of the water filter is Capillary Pumping Technique. Fluoride and other ions are not removed through conventional water filter treatments. It is a good bacterial water filter used mainly as a high volume water filter. Membranes are a type of water filter requiring regular cleaning or replacement maintenance. Henry Doulton invented the modern form of ceramic candle sanitary water filter in 1827. The filtration kits were then matched with commercial Envirogard ceramic water filter cartridges. According to newer regulations, each washing machine is equipped with a waste water filter. The Soma water filtration system consists of a glass carafe and a biodegradable water filter. It was developed after Henry Doulton's ceramic water filter of 1827. One water filter plant supplies the larger area of Nagpur city. Amway's eSpring water filter was introduced in 2000. The sculptures function as a water filter, removing pollutants from the Don River. The two most common types of ceramic water filter are pot-type and candle-type filters.