UP Aqua Slim Airstone 2 pack 10mmx25mm high

The perfect airstone for narrow lift tubes on sponge filters and undergravel filters.

Use with UP Aqua Undergravel filters.

These are the perfect replacement or upgrade to sponge filter such as Hydra Aquatics.

Use with the Hydra Aquatics Directional Outlets to convert most sponge filter brands and Hydra Aquatics Sponge Filters to airstone operation.