Maximize Water Quality with the Cut-to-fit Phosphate+Nitrate Removal Filter Pad. Keep your freshwater aquarium or pond clean and safe with this versatile filtration pad. By effectively trapping unwanted debris and particulates, it reduces harmful ammonia spikes and toxic buildup. Plus, it can be used in different filter systems and combined with other pads for enhanced filtration. Regularly changing the pad will improve water quality and promote the well-being of your aquatic pets. Features include reducing algae growth, decreasing the need for water changes, and trapping excess food, waste, and detritus. Suitable for ponds, marine and freshwater aquariums. Cut-to-size 10in x 18in filtration pad.