-50% on a selection of fish food
A UV-C steriliser passes water in front of an ultraviolet lamp that destroys the suspended algae responsible for green water, along with some free-floating bacteria and parasites. It does not replace the filter: it goes after it, on the return line. Choose its wattage according to volume, from 7 to 60 W depending on the model, with a moderate water flow to give the light time to work.
The lamp loses its effectiveness over time: replace it every season, even if it still lights up. Replacement bulbs are in this collection, and several pond filters already include a clarifier.












