Surfactants as Soil Wetters
Dry soil and grass is naturally hydrophobic, therefore water is not always readily absorbed into the ground. Instead of water absorbing to the layer below, hydrating the whole ground, it can sit on the surface and cause pooling. This is not good for soil heath or aesthetics.
The pooling is caused by the surface tension of the droplet. Breaking down the surface tension allows the droplet to collapse and spread over the surface, wetting it thoroughly without running off. This improves the rate of absorption, enhancing soil hydration and improving grass aesthetics.