WATER Water storage solutions for fire protection, potable storage, stormwater management, septic, and irrigation. XERXES Fiberglass underground tanks for potable water, fire protection, irrigation, rainwater, stormwater, septic, and chemical storage. XERXES – HYDROCHAIN™ Xerxes Hydrochain™ engineers site-specific, comprehensive water-quality systems with treatment, filtration, storage, infiltration, and conveyance options that can be used individually or as a complete stormwater management system.