The Tropical Delfin Double is a durable, air-driven dual sponge filter for freshwater aquariums up to approx. 300liters. It features two rectangular sponge blocks that can be positioned either horizontally or vertically, offering a large filtration surface for efficient mechanical and biological filtration, perfect for breeding, grow-out, or community tanks with sensitive fish or shrimp.Tropical Sponge Filter Delfin Double+ two rectangular sponge elements - usable horizontally or vertically+ large filtration area for strong biological and mechanical cleaning+ air-powered: quiet, energy-efficient, and vibration-free+ gentle intake - safe for shrimp, fry, and sensitive fishApplication & InstallationConnect the filter to an air pump using airline tubing. Rising air draws water through both sponge elements, where particles are filtered and beneficial bacteria thrive. Depending on aquarium layout, the sponges can be positioned horizontally or vertically. Clean sponges in aquarium water whe