Fully submersible and self-priming directional return pipe allows for vertical or horizontal placement three stage filtration: dense foam for particles and debris, activated carbon for toxins, odors and discoloration and patented biogrid for ammonia and nitrites compact size is perfect for placement in smaller aquariums or shallow water on average, replace cartridge every 30 days for use in aquariums, paludariums or vivariums up to 10 gallons flow rate up to 55 gph uses aqueon small replacement internal filter cartridges
