HWEIUA 55W UV Replacement Bulbs 2-Pack 2G11 4-Pin for Koi Pond & Aquarium – 8,000h Life, Quartz Tube

HWEIUA’s 2-pack of 55-watt 2G11 UV replacement bulbs clears green or cloudy pond and aquarium water by targeting free-floating algae and microbes.

If your koi pond, garden water feature, or aquarium has turned green or hazy, a properly sized UV lamp can accelerate water clarification without changing equipment. These HWEIUA bulbs are designed as direct replacements for many 55W clarifiers and sterilizers and use a high-transmission quartz tube with a 2G11 four-pin base for reliable electrical fit and consistent ultraviolet output.

Which systems will these 55W UV bulbs fit?

These 2G11 four-pin bulbs are manufactured to match the mounting and electrical requirements of common 55-watt clarifier units. They are compatible with popular pond and aquarium sterilizers and work as straightforward replacements when the original lamp has worn out.

• Fits Oase Bitron 55/110 series
• Compatible with Aqua Medic Helix Max 55
• Works in Jebao / Jebo PU-55 and CW-55 models
• Direct replacement for SUNSUN 55W and Jebao PU55 family units

How long do these UV bulbs last and when should I replace them?

The HWEIUA bulbs are built with an 8,000-hour expected service life under normal operating conditions. Over time UV output declines even while the lamp still lights, so swapping bulbs on a schedule keeps sterilization and clarification performance consistent.

• Rated life: approximately 8,000 hours
• Recommended replacement interval: every 8–10 months depending on daily run-time
• Replace sooner if water clarity returns to green or biological load increases

What safety and performance notes should I follow?

These lamps emit short-wave ultraviolet radiation peaking near 253.7 nm, which is effective at reducing free-floating algae and microorganisms but can harm skin and eyes with direct exposure. Always power down and follow the clarifier manufacturer’s safety instructions when handling or changing the bulb.

• Never look directly at an operating UV lamp
• Wear gloves and eye protection when replacing bulbs
• Ensure lamp housing and seals are intact to prevent UV leakage into the environment

Will installing these bulbs make a visible difference fast?

Many owners see progressive improvements in water clarity within days to a few weeks depending on pond size, circulation, and the current algae load. UV lamps reduce suspended algae and microbes, helping filters work more efficiently and making subsequent maintenance easier.

• Noticeable clearing often appears within several days to weeks
• Best results when used with mechanical and biological filtration
• Not a substitute for routine pond maintenance or biological balance adjustments

Who is this for: This 2-pack is aimed at pond and aquarium owners who need an affordable, compatible UV lamp replacement for 55W clarifier units. It suits hobbyists and professional maintainers using Oase, Aqua Medic, Jebao/Jebo, SUNSUN, and similar 55-watt systems who want dependable lamp life, clear water, and straightforward swap-in compatibility.