Charles Austen UVC9 Pond UV Clarifier

Charles Austen UVC9 Pond UV Clarifier

Charles Austen UVC9 Pond UV Clarifier is an inline pond UV clarifier intended for pond systems operating at up to the published 2000 L/hour maximum flow. Its published maximum output is 2000 L/hour, using 10 W total consumption. This page identifies the exact model, duty figures and selection limits so it can be compared accurately with the other products in the range.

Charles Austen is both the product brand and supplier. The figures below come from the current 2026 supplier catalogue, supported by manufacturer guidance where a current technical page is available. Maximum figures are not the same as guaranteed installed performance: pipework, depth, pressure, media loading and maintenance all affect the result.

Who is the UVC9 best suited to?

This model is best considered for pond systems operating at up to the published 2000 L/hour maximum flow. It sits 3 of 7 when the range is ordered by nominal output/capacity. That makes it easier to judge whether it is a compact entry model, a mid-range choice or one of the higher-output options before comparing price alone.

Key product features

• Dedicated UV lamp for controlling free-floating green-water algae
• Maximum water flow stated for correct exposure time
• UV lamp wattage and total electrical consumption listed separately
• Multiple sizes allow the clarifier to be matched to pond flow rather than pipe size alone
• Exact SKU and manufacturer part number: UVC9.
• Supplied through Charles Austen and linked to compatible models for easier range comparison.

Technical specification

Technical figures are nominal supplier ratings. The calculated 24-hour energy figure, where shown, is rated wattage × 24 hours and does not include tariffs or intermittent thermostat operation.

Understanding the published specification

The water-flow limit and UV lamp rating perform different jobs. The 2000 L/hour figure controls exposure time inside the clarifier, while 9 W UV lamp describes the UV-C source. Passing water faster than the stated limit can reduce exposure even when the plumbing connections fit. Total electrical consumption may differ from lamp wattage because the control gear also uses power.

The catalogue specification for this exact model is 2000 L/hour 9W 10W. Where the page includes a calculated daily-energy figure, it is provided only to make continuous-running products easier to compare; it is not an electricity-cost estimate and does not replace the rated power shown above.

How to size this model correctly

Do not exceed the stated maximum flow. A slower pass generally increases UV exposure, while an oversized pump can reduce clarification performance even when the pipework fits.

For critical livestock, treatment or commercial systems, allow spare capacity and consider redundancy. If the required duty is close to the model’s maximum, moving to the next size normally provides a more useful operating margin than running a smaller unit continuously at its limit.

Installation and commissioning

Installation format: External inline installation after a suitable pond pump and filter arrangement. Keep access available for cleaning and servicing, use appropriately sized hoses or airline, and avoid unnecessary bends or restrictions. Aquatic electrical equipment should be protected by a suitable RCD and installed in accordance with the supplied instructions.

Confirm water flow before energising the UV, check all seals for leaks and never look directly at an operating UV-C lamp. Allow time for treated algae to be captured by the mechanical filter; clearing green water is a combined UV and filtration process.

Commission the complete system by checking actual flow, pressure, water level or temperature at the point of use rather than assuming the headline maximum will be achieved. Recheck after filters, diffusers or pipework have had time to accumulate normal fouling.

Compatible system components

A UV clarifier controls free-floating organisms that pass through the chamber; it does not remove settled debris or replace mechanical and biological filtration. Install it in a serviceable line with the correct flow direction, protect it from frost and arrange valves or unions so the quartz sleeve and lamp can be maintained without dismantling the whole system.

Compatibility should be confirmed from the complete installation: connection size, hose or airline bore, voltage, control method, permitted flow and future servicing access can all affect whether two individually suitable products work correctly together.

Maintenance and service life

Isolate power and water before opening the unit. Clean the quartz sleeve carefully, replace the lamp at the recommended service interval and confirm seals are seated before restarting. Never view an operating UV-C lamp.

Record the installation date and normal operating performance. A visible reduction in output, increasing noise, rising temperature or repeated tripping should be investigated rather than compensated for by restricting or altering other parts of the system.

Performance checks and fault finding

If green water persists, verify actual flow, lamp age, quartz-sleeve cleanliness and whether the lamp is genuinely operating. Mineral deposits and biofilm reduce UV transmission. Replace lamps at the recommended interval even when they still produce visible light, because useful UV-C output declines with service time.

Compare any suspected fault with the clean, newly commissioned condition. Changes across every outlet or return normally point to the main unit or a shared restriction; a problem affecting one branch is more likely to be local pipework, airline, a valve, diffuser or connected accessory.

Compare similar UV clarifiers

The table below links to five nearby models so the buyer and search crawler can move through the range without returning to a search page.

Model	Key published duty	Product type
UVC7	1500 L/hour · 8.5 W total consumption	Pond UV Clarifier
UVC5	1100 L/hour · 7.5 W total consumption	Pond UV Clarifier
UVC11	2700 L/hour · 12 W total consumption	Pond UV Clarifier
UVC18	2800 L/hour · 18 W total consumption	Pond UV Clarifier
UVC24	3700 L/hour · 24 W total consumption	Pond UV Clarifier

Complete the system and explore the range

The supplier and customer-facing brand for this listing is Charles Austen. The links below connect this model to its dedicated range, relevant system components and the wider Charles Austen catalogue.

• Browse the Charles Austen UVC Series
• Browse all Charles Austen products
• Pond filters
• Pond pumps
• Pipework, valves and fittings

Technical information sources

Core model figures were checked against the current 2026 Charles Austen supplier catalogue. Family features, installation points and application guidance were cross-checked against current manufacturer technical material where available.