Evolution Aqua Evo UV 25 watt
Evolution Aqua Evo UV 25 watt delivers a more efficient and more economical performance and improved serviceabilty
Evolution Aqua evoUV pond clarifiers are made using the very latest technology and design techniques, ensuring there is even water flow through the unit, and optimum ultraviolet light penetration.
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Evolution Aqua Evo UV 55 wattStarting at £204.95
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Evolution Aqua Evo UV 30 WattStarting at £184.95
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Nexus 220 Ti UV Upgrade Kit£499.95 -
Nexus 320 Ti UV Upgrade Kit£599.95
Evolution Aqua EvoUV 25W UV Clarifier – High Performance UV Steriliser for Koi Ponds & Aquariums
Looking for a reliable Evo 25W UV clarifier? The Evolution Aqua EvoUV 25W UV Clarifier is a trusted choice for koi pond owners and aquarium hobbyists looking to eliminate green water and improve filtration performance.
Available for fast delivery across the UK and worldwide, this high-quality UV steriliser from Evolution Aqua is ideal for maintaining clear, healthy water in ponds and large fish tanks. Whether you're upgrading your filtration system or replacing an existing UV unit, the EvoUV 25W offers dependable performance and easy installation.
Shop online or visit us in-store for expert advice on UV clarifiers, pond filtration, and koi care.
Other unique features of the Evolution Aqua evoUV include:
- 1.5 inch inlet and outlet on all models
- Electronic Ballast
- Higher reflective index than stainless steel
- Design gives less head loss than other manufacturers models – saving energy costs.
- The evoUV units can be mounted both horizontally and vertically
- IP Rating IPX5
- 2 year warranty
- Made in the UK
Evolution Aqua’s evoUVs will be the perfect solution for pond owners looking to eradicate green water. One of the major benefits of Evolution Aqua’s evoUV range is the build quality, as they will be manufactured from hard wearing UV stabilised PE will offer a higher reflective index than a stainless steel body and will ensure that the bulbs and ballast are securely protected.
The overall dimensions of evo15 and evo25 are identical.
They are 540mm (l) x 116 mm (w) x 153 mm (h) excluding hosetails.
The distance between the centre of the inlet and the centre of the outlet is 319mm.
The evo15 uses a standard length 15W T8 UV bulb and the evo25 uses a standard 25W T8 UV bulb.
What does the EvoUV 25W UV clarifier do?
The Evolution Aqua EvoUV 25W UV Clarifier uses ultraviolet light to kill algae, bacteria, and microscopic organisms in the water. This helps eliminate green water and improves overall water clarity in ponds and aquariums.
How quickly will it clear green water?
Most users see noticeable improvements within 3 to 7 days, with full clarity typically achieved in 1 to 2 weeks, depending on water conditions, flow rate, and algae levels.
What size pond or aquarium is the EvoUV 25W suitable for?
The EvoUV 25W is suitable for:
Ponds up to around 10,000 litres (light to moderate stocking)
Smaller ponds with heavy fish loads (e.g. koi)
Large aquariums where extra sterilisation is needed
Always match the UV to your flow rate and stocking level for best results.
Does a UV clarifier kill beneficial bacteria?
No — the UV light only affects organisms passing through the unit. Beneficial bacteria living in your filter media and pond surfaces are not harmed.
Can I run the EvoUV 25W all the time?
Yes, the Evolution Aqua EvoUV 25W UV Clarifier is designed to run continuously (24/7) during the pond season. Many pond owners leave it on from spring through autumn.
How often should I replace the UV bulb?
The UV lamp should be replaced every 9–12 months, even if it still lights up. Over time, the UV output weakens and becomes less effective at controlling algae.
What flow rate is best for a 25W UV?
For optimal performance, a flow rate of approximately 4,500–6,000 litres per hour (LPH) is recommended. Slower flow improves sterilisation but must still match your filtration system.
Is the EvoUV 25W easy to install?
Yes, it’s designed for simple inline installation:
Connect to your existing pump or filter
Use standard hosetails or pipe fittings
Can be mounted horizontally or vertically
Standard Delivery Monday to Friday, via DPD or APC
You will receive from our courier tracking details once your item has been despatched, please ensure you check your email / mobile number to monitor your parcel in transit.
Delivery costs for standard items in the UK - £5.95
(Surcharges do apply to remote postcodes)
Heavy items - £9.95
Pipe - £14.95
Larger items:
Palletised items - Some large oversize products, typically items weighing more than 30kg, may require delivery via pallet. Standard Pallet charge is approx. £50.00. To ensure there are no delays with delivery, please include a contact number when placing the order.
Overseas – DHL and UPS, cost based on weight / volume at checkout.
Damages
Although we check that items we send are in good condition before despatched and are packed well to prevent damage, it is sometimes inevitable that the occasional item will get broken in transit.
Should this happen, please let us know within 24 hours of receiving your parcel. We will ask you to email us providing some images of the damage so we can address this with the courier.
We will arrange for a replacement to be sent out to you as quickly as possible, free of charge.
