Patriot Minuteman Ionizer - Pond Water Management System, For Ponds To 25,000 Gallons Complete with electronic control module, ionizer probe, threaded tee, low voltage transformer, test kit, all necessary wiring, operating instuctions Electronically detects, monitors and controls microscopic levels of copper, silver and zinc ions Dramatically reduces pond maintenance and eliminates unsightly water without chemicals Treats ponds up to 25,500 gallons 2 year warranty