The internal Crystal Filter guarantees water filtration in two stages. The first is a mechanical filtering that captures the waste and larger particles dispersed in the water through a sponge. The second, on the other hand, can be chemical or biological depending on the filter material that will be inserted in the specific compartment: activated carbon for chemical filtering and crystalline water, ceramic materials for specific biological filtering to keep nitrates at a ideal level. Equipped with special compartments for the insertion of filter materials, support bracket with suction cups. Includes activated carbon and filter cartridge. Incorporates a Venturi system for oxygenation of the water. Direction of water flow adjustable. This product is intended for indoor use only in water having a temperature not exceeding 35 degree celsius. Anti-waste drop-out design. Easy cleaning thanks to the possibility of unhooking the filter by levering the lower hook of the support.