Kindly contact me for all your brand new affordable Duraplast septic tanks and water tanks at wholesale prices. Each size is sold at a different cost. We have 1,500 litres, 3,000 litres and 5,000 litres. Each tank comes with an external filter and chemicals attached to it. Each tank is double layered. The price you see is for only 1,500 litres. Kindly call. We offer delivery and pickup services please. This system is normally good for the very moist environment