I have a aquatech power filter, not sure of the model, but it is the type with two sides (each has the carbon filter and the sponge type one that doesn't need to be replaced). The filter is 22 months old and the water output slows down. I take turns removing the 'sponge' filter and spraying it with my sink wand sprayer to remove the gunk. This speeds up the water flow but I feel that i'm removing good bacteria. I do rinse with cold water and alternate sides. My question is should I not do this and just leave it with slower water flow. Or is the power filter getting old and needs to be replaced?