The sera replacement sponge is the original filter cartridge for the air-driven sera internal filters L 150 and L 300. The fine-pored sponge mechanically retains suspended solids and dirt particles while providing a huge surface area for beneficial filter bacteria that biologically break down pollutants. If your old sponge is worn out, torn or permanently clogged, this replacement part will restore your filter to full performance in just a few seconds.

Why choose the original instead of a generic alternative?

• 100% perfect fit: Precisely designed for the intake tube and quarter-circle shape of the sera L 150 and L 300 – just push it on, and you're done.
• Shrimp-safe: The fine pores are so dense that even freshly hatched baby shrimp will not be sucked in. Ideal for breeding and rearing tanks.
• Mechanical & biological: Filters out visible dirt and serves as a home for the bacterial cultures that break down ammonium and nitrite.
• Crystal-clear water: The fine pores also retain even the smallest suspended particles – the result is visibly clearer aquarium water.

Practical tip:

Never wash the sponge under hot tap water; instead, squeeze it out in a bucket with removed aquarium water – this preserves the valuable filter bacteria. For the L 300 with two sponges, the rule is: always replace only one sponge at a time. The second one maintains the bacterial culture until the new sponge is fully established. Fine-pored foam, by the way, clogs faster than coarse foam – so squeeze it out briefly a little more often.

Product details:

• Suitable for: sera internal filters L 150 and L 300
• Material: Fine-pored filter foam
• Contents: 1 piece
  
• Original sera spare part