twilight zone;5124620; said:If it is the same material as a swimming pool filter, muriatic acid dilute with water will clean it up easily by soaking it for a short time. Of course, you should hose off what will comes off with the water hose. The acid will dissolve the lime deposits and organics at the same time. You do need to be careful when working with acid( eye protection / long sleeve shirt / gloves ). Good Luck.
That makes more sense than a bleach bath.
Since the OP was concerned about "silt" clogging I still think a powerful jet of water will be needed.
Eventually the pores will get clogged to a point where replacement is the only option, no matter how you clean it.