The Marina Slim Mini Power Filter's unique compact and slim design provides both practical and aesthetic benefits: it takes up less space than standard size filters and it brings a touch of elegance to your aquarium. The filter comes equipped with an adjustable flow control. Its motor is submerged in the water and operates very quietly. Easy installation and start-up – no priming required. Just plug it in and watch it go! Maintenance is quick, simple and convenient. The Power Filter includes 1 Bio-Carb, which contains Ceramite-, a porous ceramic filter media that supports biological filtration for a healthy aquarium. The filter also includes a strainer sponge to protect small or baby fish from being drawn into the filter. Replace media every 2-4 weeks for best water results