Internal sponge filter sera L 300 for aquariums, model SE-08535

sera internal sponge filter L 300 (model SE-08535) is a compact in-tank filtration unit engineered for combined mechanical and biological filtration in freshwater aquariums. The sponge element traps suspended particles and provides a porous surface for colonisation by nitrifying bacteria. Designed to be used with an airlift system or a small external pump, the filter supports gentle water circulation and oxygenation while remaining unobtrusive inside the aquarium.

Advantages

The open-cell sponge captures debris and prevents clogging of the water column while offering a large surface area for beneficial bacteria, improving biological filtration. Its compact size allows flexible placement inside tanks without reducing swimming space. The filter is compatible with low-flow aeration or small pumps, consuming minimal energy when combined with an efficient air pump or powerhead. Maintenance is simple: the sponge can be rinsed in tank water to preserve bacterial colonies and restored quickly to service.

Suitable for

• Small to medium freshwater aquariums requiring internal biological filtration
• Breeding tanks and fry tanks where gentle flow is preferred
• Planted aquariums that benefit from low-disturbance circulation and oxygenation
• Temporary setups, quarantine tanks, and hospital tanks needing easy-to-clean filtration

Key specifications

• Filtration type: combined mechanical and biological filtration via sponge media
• Placement: internal, fully submerged inside the aquarium
• Drive options: compatible with airlift systems or small external pumps/powerheads
• Flow characteristics: gentle, low-turbulence water movement suitable for fry and delicate species
• Maintenance: removable sponge element that can be rinsed in aquarium water

How to use

Install the sponge filter inside the aquarium in a location that ensures adequate water circulation but does not create strong currents near plants or delicate fish. Connect an airlift tube to a suitable air pump or attach a small pump/powerhead according to the manufacturer’s instructions for the drive device. Adjust the airflow or pump output to obtain a steady, gentle flow through the sponge. During routine maintenance, gently remove the sponge and rinse it in aquarium water to remove accumulated debris while retaining beneficial bacteria; replace the sponge only when it shows signs of irreversible wear.

Usage recommendations

Use with an appropriately sized air pump or low-flow powerhead to maintain gentle circulation. For best biological performance, avoid cleaning the sponge with tap water; instead, rinse it in water taken from the aquarium during a partial water change. Monitor flow and sponge condition regularly and replace the sponge if torn or excessively degraded to maintain filtration efficiency.