Marineland® products are designed with both performance and style in mind. We push precision and power beyond the expected and listened to our loyal customers to make our products even better. We do this because at the heart of our innovative spirit is a desire to help hobbyists everywhere do more, create more and, most of all, enjoy more. So whatever you’re passionate about – freshwater or saltwater, big or small, beauty or science – make your aquarium your own. The Marineland 2-in-1 Bio-Foam® & PreFilter screens out dirt and debris and supports the growth of beneficial bacteria in your Marineland Penguin® Pro 375 or Emperor® Pro 450 Filter. Use this filter foam to boost mechanical and biological filtration for premium clarity. Rinse foam monthly or as often as needed in your established aquarium water to protect good bacteria. Crystal-clear water is the mark of a healthy, thriving aquarium. The amount of filtration needed to maintain an aquarium depends on a number of variables. These include tank size, individual maintenance habits and fish population. Whatever your individual needs, Marineland brand has the filtration products you need to deliver on-target, advanced filtration. BIO-FOAM: Screens out both dirt and debris and supports the growth of beneficial bacteria – enhances biological filtration. PREFILTER: Helps protect fry – enhances mechanical filtration. COMPATIBILITY: Fits Marineland Penguin Pro 375 and Emperor Pro 450 Filters. EASY MAINTENANCE: Rinse foam monthly or as often as needed in your established aquarium to protect good bacteria. MARINELAND FILTRATION PRODUCTS: Marineland products are designed with both performance and style in mind.