Nitrate Remover Filter Foam Sponge Sheet for Aquarium/Fish Tank or Pond

The Finest Filters Nitrate Remover Foam Sheets are ideal for nitrate removal in aquariums and ponds alike This sheet measures 45 x 25cm (18" x 10"), and are approximately 12mm thick. This sheet can be cut down to size with scissors to fit most internal, external and sump filters. This foam is designed to remove Nitrate from the aquarium water. Nitrate can become toxic if left to accumulate in the aquarium, causing stress to the aquarium inhabitants.