Spiral wrapped fluid treatment element

An element for treating a fluid flowing through the element, the fluid treatment element comprising:

• a permeable filter medium having a hollow configuration, an external surface, and an end;
• a permeable wrap having successive overlapping windings spirally wound around and completely covering the external surface of the filter medium wherein the hoop strength of the spirally would element is sufficient to withstand inside-out flow at a pressure drop of at least 75 psid, less than 10% of the pressure drop being across the permeable wrap, each winding of the permeable wrap being positively fastened to at least one of the filter medium and a previous lapped winding;
• and
• an end cap secured to the end of the filter medium and the permeable wrap.