Would 30 ppm Chlorine burn off particulates?

[waterbear]

As a temporary solution you might try soaking your cartridge in a solution of TSP (1cup per 5 gallons water) for an hour in a plastic garbage can, hosing it off and then if there is any scale deposits soak in a solution of muriatic acid (also 1 cup per 5 gallons water) and then hose it off completely. If there is a lot of green algae in the filter hit it with bleach and let it sit for while until the algae is decolorized (soaking is best....about a 2 to 1 dilution) BEFORE the TSP and the acid and rinse it off. This will help remove any organics or scale plugging up the cartridge material and should improve the filtration.

There are also commercial cartrdige cleaners that are effective. Check your local poolstore or walmart