Filter housing for aquarium K&N FILTERS Aqua Natura — spherical cartridge, inlet diameter 178–222 mm

Replacement filter housing from K&N FILTERS Aqua Natura designed for a spherical cartridge with an installation/inlet opening diameter of 178–222 mm. The housing provides mechanical support and sealing for a round filter medium, enabling secure integration into aquarium filtration systems that use this cartridge size. Constructed to match the geometry and connection requirements of spherical cartridges, it helps maintain correct flow direction and contact between water and filter media.

Advantages

The housing is tailored for spherical (kuli) cartridges and ensures stable positioning and reliable sealing without introducing additional adapters. Its dimensions accommodate cartridges with inlet diameters from 178 to 222 mm, reducing the risk of leaks and misalignment. The design supports consistent water flow through the filter media and is compatible with systems requiring this specific cartridge form factor.

Suitable for

• Replacement of worn or damaged spherical cartridge housings in aquarium filtration systems
• Integration into custom filtration setups using Aqua Natura spherical cartridges
• Maintenance projects where exact cartridge diameter fit (178–222 mm) is required

Key specifications

• Type: housing for spherical cartridge
• Compatible cartridge shape: spherical (round/kuli)
• Installation/inlet opening diameter: 178–222 mm
• Function: mechanical support and sealing for filter media
• Intended use: aquarium filtration systems

How to use

Ensure the aquarium filtration system is switched off and any water flow is stopped before replacing the housing. Remove the old housing or cartridge, verify that the new housing's inlet diameter matches the spherical cartridge and the system mounting points, then insert the cartridge and seat it evenly inside the housing. Reassemble connections and seals according to the filtration system's instructions, restore water flow, and check for correct alignment and any leaks during initial operation.

Usage recommendations

Regularly inspect seals and seating to prevent bypass and leakage; replace worn O-rings or gaskets as needed. Use only spherical cartridges that fit within the specified 178–222 mm inlet diameter to maintain filtration efficiency and avoid mechanical stress on the housing.