Green Killing Machine 9W (up to 200L)

Struggling with green water or cloudy aquarium water? The Green Killing Machine 9W makes tackling green water simple, with a compact internal UV filter and built-in powerhead that can be placed directly inside your aquarium.

Designed for aquariums up to 200L, the Green Killing Machine uses UV technology to help eliminate green water and reduce unwanted microorganisms in the water. The compact design can also be positioned behind plants or ornaments, keeping the unit discreet while it works.

There's no need for external pipes, hoses or complicated plumbing. Simply submerge the unit, secure it with the suction cups and let the built-in pump circulate water through the UV system.

Key Features

• Suitable for aquariums up to 200L

• 9W UV sterilising lamp

• Built-in water pump and filtration sponge

• Helps clear green water

• Submersible design

• No external plumbing or hoses required

• Suction cup mounting for easy installation

• LED indicator lets you know when the UV bulb needs replacing

• Replacement UV bulbs are available separately

• Pump and UV bulb have individual plugs

• Limited 1-year warranty against defects in materials or workmanship

What is a UV filter used for?

A UV filter uses ultraviolet light to help control free-floating microorganisms and algae in aquarium water. The Green Killing Machine is particularly useful for green water, where suspended algae can turn an aquarium noticeably green.

It can also help improve water clarity by reducing organisms that are passing through the UV chamber.

Easy Internal Installation

The Green Killing Machine is designed to sit inside your aquarium, with the pump circulating water through the UV unit. There's no need to drill holes, connect external pipes or install additional plumbing.

The unit can be positioned behind aquarium plants or ornaments if you'd prefer to keep the equipment out of sight.

UV Bulb Replacement

UV bulbs gradually lose their effectiveness with use. The bulb typically lasts around 6–9 months with continuous use, although lifespan can vary and some bulbs may last up to a year.

The Green Killing Machine includes an LED indicator to help let you know when the UV bulb needs replacing, and replacement bulbs are available separately.

Wonderworld Tip

If your aquarium has suddenly turned green, a UV unit can be a very useful tool for getting the water clear again. However, it's still worth looking at why the green water has appeared in the first place, including lighting, nutrients and aquarium maintenance.

If you're unsure whether a UV filter is the right solution for your aquarium, bring us the details of your tank and we'll be happy to help.

What size aquarium is the Green Killing Machine 9W suitable for?
The Green Killing Machine 9W is designed for aquariums up to 200 litres.

Will the Green Killing Machine clear green water?
The Green Killing Machine uses UV technology to help eliminate the free-floating algae responsible for green water, helping improve water clarity.

Does the Green Killing Machine need external plumbing?
No. The Green Killing Machine is a submersible internal unit with its own water pump, so it does not require external hoses or plumbing.

How long does the Green Killing Machine UV bulb last?
The UV bulb typically lasts around 6–9 months with continuous use, although some bulbs may last up to a year depending on use.

Does the Green Killing Machine have a filter?
Yes. The unit includes a filtration sponge along with the water pump and UV system.

What other Green Killing Machine sizes are available?
The Green Killing Machine range includes a 3W Mini for aquariums up to 80L, 9W for aquariums up to 200L, and 24W for aquariums up to 450L.