Hydro Drain is a specially developed clay substrate for use as a drainage layer in humid and tropical terrariums. The high-quality clay granules store large amounts of water and release it continuously into the terrarium environment. This creates a stable, elevated humidity level, which is essential for tropical reptiles, amphibians, and plants.

Hydro Drain is installed beneath the actual soil substrate, allowing excess water to drain downwards in a controlled manner. The stored water is then available to the plants as groundwater, while simultaneously preventing waterlogging of the topsoil.
Once the maximum water storage capacity is reached, excess water can easily remain on the terrarium floor without affecting the substrate.

For optimal setup, a drainage layer at least 3 cm high is recommended, covered with Hydro Fleece. This is followed by the actual substrate, such as terrarium humus or jungle bedding. Hydro Drain is also suitable for use with underfloor heating and is therefore ideal for modern, planted, and bioactive terrarium systems.