Green or cloudy aquarium water? With the XIIW UVC clarifier, your water becomes clear again

Green, brown, or milky cloudy water in the aquarium is not only annoying, but can also disrupt the natural balance in the tank. The XIIW 4-in-1 Aquarium UVC Clarifier combines a powerful submersible pump with an integrated UV-C lamp, coarse pre-filtration, aeration, and flow generation – for clear, stable, and healthy aquarium water.

The integrated 8W UV-C lamp with 254 nm helps reduce suspended algae, bacteria, and unpleasant odors in the water. Depending on the amount of algae, tank volume, and water condition, the aquarium water can become visibly clearer after as little as 2–7 days.

Your benefits at a glance

• Effective UVC water clarification: Supports clear water in green, brown, or milky cloudiness.
• Strong 1800 L/H flow rate: Ideal for larger aquariums with a volume of approx. 300–700 liters.
• Powerful 25W pump: Ensures reliable water circulation and even distribution in the tank.
• 8W UV-C lamp: Helps reduce suspended algae, bacteria, and odors caused by cloudy water.
• 4-in-1 function: UVC clarification, coarse pre-filtration, aeration, and flow generation in one compact device.
• Integrated timer: Flexible runtimes of 4H / 8H / 12H / 24H can be selected depending on water condition.
• Stable water balance: Supports a healthy ecological cycle in the aquarium.
• Fewer water changes: Helps keep water quality clear and stable for longer.
• Suitable for fresh and salt water: Ideal for green water, whitish cloudiness, or odor formation.

Typical areas of use

• Freshwater aquariums: For green water caused by suspended algae.
• Saltwater aquariums: For whitish-milky water cloudiness.
• Large ornamental fish tanks: Suitable for aquariums with approx. 300–700 liters.
• Aquariums with odor formation: Helps reduce unpleasant odors caused by bacteria.
• Tanks with oxygen demand: Aeration function supports oxygen supply.
• Aquariums with weak water movement: Flow mode improves circulation in the tank.

Fourfold function for a healthy aquarium

The XIIW Aquarium UVC Clarifier combines several important functions in one device. This saves you additional equipment in the aquarium and improves water clarification, water movement, and oxygen supply at the same time.

• UVC clarification: Supports the reduction of suspended algae, bacteria, and cloudy water.
• Coarse pre-filtration: Helps capture visible dirt particles and residue in the water.
• Aeration: Promotes oxygen supply and supports an active aquarium environment.
• Flow generation: Ensures natural water movement and better circulation.
• Rainforest river mode: Creates lively water flow for a natural aquarium experience.

Usage recommendation

If the water turns green, brown, or milky cloudy, a water change is recommended first. The UVC function can then be activated. In the event of acute cloudiness, the UVC lamp should be switched on for about 4–8 hours daily. In many cases, the water becomes noticeably clearer within about 3 days.

After the water has cleared, it is recommended to use the UVC lamp regularly – for example on the first day after a water change or once a week, even without a water change. In the case of severe green cloudiness and lack of oxygen, the aeration mode together with UVC 24H can be used.

Important note: UV-C light must not be directed at fish, plants, skin, or eyes. The device must be mounted correctly under water and operated according to the instructions. If fish behavior is abnormal or symptoms of illness appear, a specialist retailer or veterinarian should also be consulted.

Installation & operation

• The submersible pump body must always be positioned below the waterline.
• Vertical installation: Minimum water level approx. 24 cm.
• Horizontal installation: Minimum water level approx. 9 cm.
• The UVC timer can be set depending on water volume and water condition.
• Selectable operating time: 4H / 8H / 12H / 24H.
• For green cloudiness with lack of oxygen: perform a water change and activate aeration mode + UVC 24H.

Technical data

Frequently asked questions (FAQ)

Does the XIIW UVC clarifier help against green water?

Yes. Green water is often caused by suspended algae. The integrated UV-C lamp helps reduce them and make the water clearer again.

How long should the UVC lamp stay on?

In the event of acute water cloudiness, about 4–8 hours per day is recommended. In the case of more severe green cloudiness, the 24H mode can also be used depending on the situation.

When will the aquarium water be clear again?

Depending on the amount of algae, tank volume, and water condition, visible improvement may occur after 2–7 days. Often the water becomes clearer after about 3 days.

What aquarium size is the device suitable for?

The XIIW UVC clarifier with a flow rate of 1800 L/H is suitable for aquariums with a volume of approx. 300–700 liters.

Can the pump be used continuously?

The pump can be used regularly for water circulation, aeration, and filter support. The UVC function should be controlled via the timer depending on water condition.

Is the device suitable for fresh water and salt water?

Yes, the device is suitable for both freshwater aquariums and saltwater aquariums.

Conclusion

The XIIW 4-in-1 Aquarium UVC Clarifier with 1800 L/H is the ideal solution for larger aquariums where green, cloudy, or unpleasant-smelling water needs to be reduced. With UVC clarification, coarse pre-filtration, aeration, and flow generation, it supports a clear, stable, and healthy aquarium environment – all without additional devices.

Order now and give your aquarium clear, fresh water again!