Compact Aeration Series Aerators provide adequate oxygen levels and circulation for pond and fish care. During hot summer months or de-icing during freezing months the CAS Pond Aeration Kits will provide quiet and energy-efficient aeration. This complete kit is perfect for aquariums, water gardens or koi ponds. Add oxygen and cycle nutrients to your pond or aquarium with this small but powerful aerator! Suitable for ponds up to 1000 gallons.