Yamitsu Algae Master Pond UV Clarifiers
Straightforward 11W to 110W UV-C clarifiers for green-water control, with practical sizing and servicing advice
Yamitsu Algae Master is a familiar range of inline pond UV clarifiers covering 11, 15, 25, 30, 55 and 110 watts. They suit traditional pump-and-filter circuits where the aim is reliable green-water control without app control or a complicated electronic system.
A UV clarifier treats water only while it passes the lamp. The wattage printed on the body is therefore only one part of selection: pond volume, sunlight, fish load, actual flow and exposure time all matter. The mechanical filter must then capture the affected algae.
We keep the whole family together so owners can compare units and find the corresponding Yamitsu lamps and quartz sleeves. Before ordering a replacement, check the label on the existing unit because visually similar older housings can use different parts.
Price range: £84.95 through £171.35 (inc VAT)
Choose From the Six-Wattage Range
The range runs from the compact 11W Algae Master and 15W Algae Master through the 25W, 30W and 55W units to the twin-lamp 110W Algae Master.
Do not select purely by choosing the smallest published pond-volume claim. A heavily stocked koi pond in full sun needs a more conservative approach than a shaded wildlife pond, and a high actual flow may require more exposure capacity.
Position, Flow and Pipework
Install the UV in the orientation shown for the exact Algae Master model, with enough straight, supported pipework and service clearance to remove lamps and quartz. Unions or flexible connectors make annual maintenance far easier.
Measure the pump’s delivered flow after lift, pipe friction and filter resistance. Maximum pump flow at zero head is not the flow passing the UV. Avoid an unnecessary small-bore restriction at the unit.
Keeping an Algae Master Effective
Replace lamps at the service interval even if they still emit visible light. Clean mineral scale and biofilm from the quartz with a suitable non-abrasive product, inspect seals and leak-test before restoring power.
If green water returns, check the lamp, quartz, real flow, bypass valves and mechanical filter before simply buying a larger UV. A fault elsewhere in the circuit can make a correctly sized unit look inadequate.
Our advice: tell us the model on the label, not just the lamp wattage. We can match the bulb, quartz and seals and help you avoid opening the unit twice.
Related Categories and Useful Next Steps
All pond UV clarifiers · Replacement UV bulbs · Quartz sleeves · UV mounting accessories · Pond filters · Filter pumps
Frequently Asked Questions
What sizes are in the Algae Master range?
The category covers 11W, 15W, 25W, 30W, 55W and 110W models.
What does an Algae Master UV control?
It is intended primarily for suspended single-celled green-water algae.
Will it kill blanket weed?
No. Attached filamentous blanket weed needs a different approach.
Is the 110W model a twin-lamp unit?
Yes. Identify both lamps and the correct sleeves when servicing it.
Should I select only by pond volume?
No. Include fish load, sunlight, water temperature, actual flow and filtration.
Why does actual flow matter?
It determines exposure time. Flow that is too fast can reduce the treatment received in one pass.
Can I use the pump’s maximum-flow figure?
Not as the installed figure. Lift, pipework and equipment resistance reduce it.
Does the UV replace mechanical filtration?
No. The filter still has to capture the affected algae and solid waste.
Why is my lamp glowing but the pond is green?
Visible glow does not prove strong UV-C output; also check lamp age, quartz scale, flow and bypasses.
How should the unit be oriented?
Use the manual for the exact model and make sure air cannot remain trapped around the lamp chamber.
Can I clean the quartz sleeve?
Yes, with a suitable non-abrasive method while the unit is electrically isolated.
Should seals be replaced during service?
Replace flattened, split or hardened seals with the correct Yamitsu parts.
Can I look at the lamp while it is on?
No. UV-C can damage eyes and skin; isolate power before opening the unit.
Are all Yamitsu sleeves interchangeable by wattage?
No. Match the exact Algae Master model and generation.
Can you help size or identify a unit?
Yes. Send the pond details or a clear photograph of the model label and existing installation.
