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The Optibox system, with a 95% void ratio, represents a new generation of SAUL units with three-dimensional diffusion. It provides temporary stormwater storage and enables the construction of underground public or private structures that can be inspected and easily hydro-cleaned.

The AZbox system, with a 95% void ratio, ensures the temporary storage of rainwater and allows for the creation of public or private underground structures that are controllable and hydro-cleanable.

The underground rainwater storage modules nidaplast EP and nidaflow EP are polypropylene honeycomb blocks belonging to the SAUL family (Ultra-Light Honeycomb Structures).