Natural arsenic contamination is a major concern these days in the world including Ganga-Meghna-Brahmaputra delta regions of India. The filtering cartridge is based on three-stage purification technology, where (a) a first layer of cleaned sand is used to remove larger size solid particles, (b) a second layer of mixed metal-oxides (copper oxide:  iron oxide = 1:3) impregnated activated rice husk char and alumina to remove arsenic including fluoride, and bacteria, etc. (c) a third layer of cleaned stone chips further used to stop leaching of chemicals and nanoparticles into purified water. All the adsorbents are placed stage-wise in a container, which acts as cartridge of the arsenic removal plant. This plant is useful for removal of arsenic from ground water which may contain arsenic of 0.01 – 0.50 ppm to below WHO limit (<10 ppb). The plant can filter ~40000 liters of the contaminated water with a flow rate ~400 liters/hour before replacing the cartridge.