TetraPond Replacement 9W UV Bulb for GreenFree UV Clarifier – Ponds Up to 1,800 gal | Pack of 1

Overview

Keep your pond looking clean and inviting with the TetraPond GreenFree UV Clarifier replacement bulb. This 9-watt bulb is designed to pair with the GreenFree unit, delivering efficient ultraviolet light to help curb green water and maintain clarity during the pond season. With an expected life of around 8,000 hours, it provides steady performance that supports your filtration system while you enjoy the scenery and wildlife that your pond attracts.

The bulb is engineered for up to 11 months of continuous operation, making it a practical seasonal replacement that aligns with typical pond care routines. While the bulb can glow beyond its prime, its effectiveness in reducing algae blooms naturally declines over time, so planned replacement helps sustain clearer water without guesswork.

Key benefits

• REPLACEMENT BULB: For use in TetraPond GreenFree UV Clarifier to control heavy algae blooms and keep water clean and green-free
• ULTRAVIOLET LIGHT: Destroys the reproductive ability of single-celled algae
• ANNUAL MAINTENANCE: Replace bulb every pond season for continued algae control
• HIGH-EFFICIENCY: For up to 11 months of continuous operation
• FOUR SIZES: 5 watts for ponds up to 660 gallons; 9 watts for up to 1,800 gallons; 18 watts for up to 4,400 gallons; 36 watts for up to 8,800 gallons

Real-life use and what to expect

In a typical pond setup, you’ll place this 9-watt bulb inside the GreenFree UV Clarifier. When the unit is running, you can rely on the viewing window to confirm that the bulb is active and emitting light through the water path. The result is a clearer water column as cells are exposed to UV light, hindering their ability to reproduce and be carried through the filtration system.

Algae blooms often respond to proper UV exposure. With regular maintenance, many pond owners notice visible improvement within the first week of replacement, and clearer water can persist with ongoing upkeep. Plan replacements at the end of each pond season to maintain this level of clarity, while balancing other seasonal cleaning tasks.

Brand context

Since 1951, Tetra has expanded from fish foods to a wide range of fishkeeping solutions aimed at making care simpler and more enjoyable. The GreenFree line emphasizes ease of use and reliable performance, helping hobbyists and newcomers alike keep their water features vibrant and healthy across the seasons. This replacement bulb is a practical, no-nonsense component for customers who want straightforward maintenance without overpromising results.