Cascade&reg; Filter Replacement Cartridges for Cascade 150/200 Hang-on Power Filters, 12-pack Convenient 12 pack of filter cartridges Convenient, no-fuss replacement cartridges for your Cascade 150 OR 200 hang-on power filter. Floss barrier traps particular matter keeping your aquarium clean & clear. Activated carbon removes ammonia & nitrites keeping your aquarium healthy.