Aquascape. The RainXchange system combines sub-surface rainwater collection with an above-ground recirculating water feature. Rainwater from the gutters collects in an underground rain filter and is then sent to a modular storage basin; water is pumped to either the irrigation hose or recirculates through the above-ground decorative water feature and biological filter and back into the storage basin. An overflow tank allows excess rainwater to infiltrate the soil and aquifer. www.rainxchange.com.