UV light pond cleaner

[ADuckOnQuack]

I’ve been told to purchase a uv light to clean green water in the pond. The pond is 5000litres and it would cost £260 for one of these uv light kits from oase. Is there another reliable brand/product that will do the job but cheaper? Or is £260 what I’m going to have to pay to keep the water clean. Thanks

 

[CarpCharacin]

I have a 55 watt Jebao UV on my 1500 gallon pond. When I originally built my pond, I also had a problem with green water, so I got the Jebao UV, and that made it clear up. https://www.amazon.com/Jebao-STU-Stainless-Steel-Clarifier/dp/B0115MS7RY