Clay pots are porous and allow water to seep through the walls, which helps to cool the water naturally. Natural filtration: Clay is a natural filter and can help to remove impurities from the water, such as sediment, bacteria, and other harmful substances. Earthen pots retain the oil and give moisture to food so you don't add unnecessary fat to make your food tastier. It is said that clay pots add many important nutrients like calcium, phosphorus, iron, magnesium and sulfur to food, which are extremely beneficial to our body.