BIO-UV Professional Pond UV Systems
BIO-UV 20, 30 and 40 plus Delta UV EA-4H models for demanding pond installations
BIO-UV Professional units are aimed at pond keepers and installers who want a robust external UV system rather than a small garden-pond clarifier. Our range includes BIO-UV Professional 20, 30 and 40 models alongside Delta UV EA-4H-15, EA-4H-20 and EA-4H-40 units.
The number in a UV name is useful for identifying the product, but it should never be turned directly into a pond-volume rule. The correct unit depends on the treatment dose required, actual flow through the chamber, water clarity, fish load and exposure to sunlight.
These systems deserve proper plumbing: isolation valves, unions and enough clearance to withdraw the lamp and quartz sleeve without dismantling the entire filter house.
Two BIO-UV Families on This Page
The BIO-UV 20 Professional, BIO-UV 30 Professional and BIO-UV 40 Professional form the core professional family. The Delta UV EA-4H-15, EA-4H-20 and EA-4H-40 are a separate Delta UV format.
Do not order a replacement lamp or quartz sleeve from the wattage alone. Use the full model and serial details.
Size from Flow and Dose
UV treatment is exposure over time. Pushing more water through a chamber reduces contact time; heavily stocked koi systems may need a more demanding dose than a lightly stocked ornamental pond.
Use the manufacturer table for the purpose, then verify the real flow after filter and pipe losses. A pump’s maximum label is not the flow passing the UV.
Build in Service Access
Install unions and isolation so the chamber can be drained safely. Leave straight clearance for lamp and sleeve removal, support the unit properly and protect control gear from weather as instructed.
Our advice: before buying a professional UV, sketch the filter house. Access and flow are just as important as wattage.
Related Categories and Spares
All UV clarifiers · BIO-UV replacement lamps · UV spares · Pond filters · Pond pipework
Frequently Asked Questions
Which BIO-UV models are in this category?
BIO-UV Professional 20, 30 and 40 plus Delta UV EA-4H-15, EA-4H-20 and EA-4H-40.
Are BIO-UV Professional and Delta UV the same family?
They are separate product formats and need model-specific spares.
Can I choose between 20, 30 and 40 from pond litres alone?
No. Use the manufacturer dose and permitted-flow data for the actual application.
Why do I need unions around the UV?
They allow the chamber to be isolated and removed without cutting the pipework.
How much service clearance is needed?
Enough to withdraw the complete lamp and quartz sleeve in the direction specified by the manual.
Can I fit a Delta lamp to a Professional unit of similar wattage?
Do not assume so. Match the complete model, lamp code, dimensions and electrical gear.
Is this range suitable for koi ponds?
Potentially, when sized for the higher fish load and required dose rather than an optimistic maximum pond volume.
Will a UV clarifier remove blanket weed?
No. UV-C can help with single-celled algae carried through the unit, which is what causes green water. Attached algae and blanket weed need a different approach.
Does clearer water mean the pond filter is no longer needed?
No. UV treatment clumps suspended algae, but the mechanical filter still has to collect it and the biological filter still processes fish waste.
Can I choose a UV only by wattage?
Not reliably. Pond volume, flow rate, fish load, sunlight, chamber design and the manufacturer’s recommended dose all matter.
Why does the quartz sleeve need cleaning?
Limescale and biofilm reduce the UV reaching the water even when the lamp is working. A clean sleeve is essential to useful output.
Can I look at a lit UV-C lamp?
No. UV-C can injure eyes and skin. Isolate the electrical supply before opening the unit and follow the manufacturer’s safety instructions.
Should the UV run before or after the biological filter?
Follow the system and manufacturer layout. The important points are the permitted flow, correct orientation, full water coverage and safe access for servicing.
Can you check which model suits my pond?
Yes. Tell us the pond volume, fish stock, pump flow, pipe size, filter model and whether the pond is in full sun.
When should I replace the lamp?
Use the interval stated for the exact lamp and unit. UV-C output falls with age even when the lamp still produces visible light.
