Tetra EasyCrystal Filter Sponge 250/300

Biological filter foam for EasyCrystal 250 and FilterBox 300 — rinseable and durable

Large surface area for bacterial colonization — less frequent replacement than the filter pack

✅ Level: Easy — Rinse with aquarium water. No tools required.

The Tetra EasyCrystal Filter Sponge 250/300 is the biological filter foam for the Tetra EasyCrystal Filter 250 and EasyCrystal FilterBox 300. The fine-meshed sponge offers a large surface area for beneficial nitrifying bacteria for intensive biological filtration. Rinseable in aquarium water — longer lifespan than the filter pack.

🔧 Product specifications

🚚 Delivery & warranty

• Fast delivery from our store — ready to use immediately
• Shipping Tuesday or Friday → Read more about shipping
• Delivery with track & trace, usually within 1–2 business days
• Problem with your order? We'll solve it together. Contact us via our customer service.
• Free shipping from €59,-

✂️ Usage tips

Rinse the filter sponge monthly with aquarium water — never with tap water. Only replace it when visibly damaged or after prolonged use. Never perform sponge cleaning and filter pack replacement simultaneously to maintain the biological filter cycle.

💡 Tip

The filter sponge and filter pack work together for optimal filtration — never replace them simultaneously to preserve beneficial filter bacteria.

❓ Frequently asked questions

How often should I replace the filter sponge?
The filter sponge needs to be replaced less frequently than the filter pack. Rinse monthly and only replace when visibly damaged.

What is the difference with the Filterpack 250/300?
The Filterpack is the primary replacement filter material (every 4 weeks). The Filter Sponge is the biological filter foam that is replaced less frequently and can be rinsed.

Do you have another question? Feel free to contact us — we are happy to help you make the right choice for your aquarium.