coospider-repta 13W UV-C G23 Pond UV Replacement Bulbs 4-Pack — 7.25" Quartz, 8,000+ hr

The coospider-repta 13W UV-C G23 bulb is a replacement ultraviolet lamp designed to reduce free-floating algae and clarify pond water when installed in compatible pond clarifiers.

This four-pack of 13-watt UV-C lamps fits fixtures that accept a G23 base and is engineered for high transmission using a quartz tube to deliver a peak UV output around 253.7 nm. Each lamp is rated for more than 8,000 hours of operation and carries EPA Est. No. 96998-CHN-1, making it a straightforward swap for many popular pond clarifier models from brands like Jebao, SUNSUN, AQUATOP, Tetra, ViaAqua, and Grech.

How does this bulb improve pond water clarity?

The bulb emits short-wave UV-C light that targets microscopic free-floating organisms that make water appear green or cloudy. By disrupting these organisms' ability to reproduce, the lamp helps your clarifier remove them more efficiently through its filtration system.

• Peak wavelength ~253.7 nm for effective UV-C action
• High-transmission quartz tube for stronger UV delivery
• 13W power compatible with many pond clarifiers
• Works in-line with mechanical and biological filtration

Will this bulb fit my pond clarifier?

This lamp is built with a G23 base and measures about 7.25 inches in length, making it compatible with units designed for that socket and size. It's sold as a universal replacement, so it commonly fits models from several major manufacturers—but always check your unit's socket type and lamp length before purchasing.

• G23 base standard for many pond clarifiers
• 7.25" length to match fixtures requiring that size
• Compatible brands: Jebao, SUNSUN, AQUATOP, Jebo, Tetra, ViaAqua, Grech
• Replace every 8–10 months depending on usage

How long will the bulb last and what maintenance is needed?

Each bulb is rated for over 8,000 hours of use; performance gradually declines with age, so replacing it every 8–10 months is recommended for consistent results. Routine checks of the lamp and the clarifier housing—keeping quartz sleeves clean and ensuring proper sealing—help maintain output and safety.

• Life expectancy: >8,000 hours
• Typical replacement interval: every 8–10 months
• Keep quartz sleeve clean to maximize UV transmission
• Inspect seals and electrical connections during replacement

Are there safety or warranty considerations I should know?

The lamp emits ozone-free short-wave UV radiation and should never be viewed directly while powered; protective measures and correct installation are essential. The product includes a 180-day warranty and customer support aims to respond within 24 hours for issues during the warranty period.

• Ozone-free UV peak at 253.7 nm
• Avoid direct eye and skin exposure to the lit bulb
• 180-day warranty with responsive customer service
• EPA Est. No. 96998-CHN-1 noted on product

Who is this for: This coospider-repta 13W G23 UV-C bulb is suited for pond and water-garden owners using compatible inline clarifiers who want a replaceable, high-transmission lamp to help control suspended algae and improve optical clarity. It's a practical choice for hobbyists and maintenance professionals replacing expired or underperforming UV lamps in popular clarifier brands, provided the G23 base and lamp length match the existing fixture.