Sera Sponge Hard 2 Pack
Cleaning sponge for persistent dirt
- cleaning sponge with woven steel wool coating on one side
- also removes persistent spot algae and lime marks
- soft support material for removing biofilm and thin periphyton layers
- ideal for glass and other hard, smooth surfaces
- in a practical twin pack
| Feature | Description |
|---|---|
| Coating Type | Woven steel wool on one side |
| Surface Type | Hard, smooth surfaces such as glass |
| Removes | Persistent spot algae, lime marks, biofilm, thin periphyton layers |
| Pack Size | 2 pieces |
FAQ
Can this sponge be used on ceramic or stone surfaces?
Yes, it is ideal for hard, smooth surfaces including ceramic and stone.
Is the sponge safe for use on aquarium glass?
Yes, it is specifically designed for use on aquarium glass and can effectively remove algae and biofilm without scratching.
Does the sponge require any special cleaning or maintenance?
Please contact customer service

Faith Lawrence –
This sponge works well for removing algae from my aquarium glass. The steel wool side is effective for stubborn spots, and the soft side gently removes light biofilm without damaging the surface. I use it regularly and it lasts longer than other sponges I’ve tried.
Justin Henderson –
Great for removing lime marks on my bathroom mirror. The twin pack is convenient and the sponge holds up well after repeated use. A little more aggressive than I expected, but effective for tough stains.
Sue Bell –
I’ve had issues with algae buildup before, and this sponge finally solved it. It’s easy to clean and the steel wool side removes spots that other sponges couldn’t touch. Highly recommend for aquarium and glass cleaning.