Submersible UV Sterilizer Lamp — 5–11 W

A submersible UV lamp that clarifies green water and knocks back suspended algae, bacteria and parasites in the water column. Drop it in, run it a few hours a day, and watch green fog water go glass again.

• Clears green water. UV scrambles suspended algae that filters alone can't catch.
• Water-column sanitiser. Reduces free-swimming pathogens during outbreaks.
• Two sizes. 5 W for tanks to ~200 litres, 11 W for larger displays.
• Use responsibly. Don't look directly at the lit tube, and replace the bulb yearly — UV output fades.