Spun Type They are used for normal filteration and do not have a long life. Wound Type They are used for filtering water with high turbidity as their surface area, and dirt holding capacity is more. Pleated Type These are high efficiency cartridges, which can even stop bacteria and other pathogens, which are present in the water. They have a long life of more than six months. The biggest advantage is that they are washable for any number of times.