Then holding the plastic end cap, slide the cage over the batting until it rests against the plastic cap. Then insert your new filter into your pump. ...
After looking at some of the other suggestions I figured I could come up with my own version of a pool filter. and make it reusable. So I started with a filter I had washed and bleached a few times. There is a top and bottom plastic cap that the filter paper is embedded in. The center plastic core is held in place by the paper and caps. You will need the following:
Epoxy glue or a non-water soluble glue.
Wire cutters, snips or good strong scissors.
Poly batting. (used in quilting)
one used pool filter
wire mesh, Galvanized (I used 1/4" square mesh)
Needle nose pliers(helps with joining the ends together)
I used a pair of wire cutters to cut through the paper filter near one of the plastic caps. Being very fibrous and thick, it would just tear out. So cutting worked best. Try to get it as close to the plastic cap as possible. You don't want to damage the plastic cap or the center core. Since the filter is embedded into both end caps, you only need to cut off of one cap. After you have removed the filter paper epoxy the center core onto the plastic end cap.
Roll a piece of the mesh the same size as the diameter of your filter. I left mine a couple of inches taller to help form the top. Once you have the size, cut your wire along one side of each "square" leaving "tabs" of wire. Use those "tabs" to wrap around the opposite end to form a cylinder. Once you have the cylinder made, size the height and make cuts every 3/4" down the length of the cylinder, leaving the extra length of wire attached. Fold each piece over towards the center layering each piece over the previous. This will form the hole in the top that will fit over the socket at the bottom of the pump. This is the cage that will hold the poly batting in place.