The pleated spa filter should be chemically cleaned about once every two months, and should be inspected and rinsed every month. This removes oils, dirt and scale residue and reduces the strain on the spa pump motor. Use a powdered filter cleaner, submerge filter in bucket and add chemical according the label instructions. Let sit overnight and then rinse filter. Using a filter cleaning attachment for your hose is a good idea, it shoots the water with higher pressure and you are able to direct it into the pleats better. Pleated spa filters should last a long time a few years or more with regular maintenance, but once the material begins to visably degrade you should replace the filter.