The pool filter tank o'ring is an important part in the proper function of your pool filter. If the tank o'ring is not in good condition it could cause the filter tank to leak and/or loose pressure.  It is imperative to check the condition of the pool filter tank o'ring each time you clean or change the cartridges or DE grids.  Please visit our article "When to Change Your Pool Filter Tank O'ring" for more detailed information. Begin by selectingtheanufacturer of your pool filter below.