UltraZap pond UV sterilizers use UV light to keep water clear: as water passes through the unit, free-floating algae and harmful microorganisms are destroyed, so green water in a pond, koi setup or large fish tank is treated at the source. Match the wattage to your volume — the range covers a small decorative pond up to a 50 000-litre koi pond, and an aquarium UV sterilizer is the standard answer for green water that filter media alone can’t catch.

Good to know:
– Four sizes: 8W, 15W, 30W and 55W
– 55W suits ponds of up to about 50 000 litres
– Targets free-floating algae and microorganisms for clearer water
– Low-maintenance treatment for ponds, aquariums and fish tanks