I read somewhere that I can simply hose off my Sta-rite Posi Flo filter cartridge and re-use it. I've done that a few times using a lot of pressure, and the crud that comes out is amazing. Wow. I leave it looking fairly white.
Those cartridges are quite expensive so being able to re-use is certainly a benefit. But, I ask how long or how many times can I keep doing that?