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The Laguna 24-Watt UV Bulb (MPN: PT1603 ) is a
genuine replacement ultraviolet lamp designed for pond filtration and sterilization systems .
Specifications & Compatibility
- Wattage: 24W
- Base Type: 2G11 (4-pin PLL style)
- Dimensions: Approximately 1-3/4″ width x 12-1/2″ length (12-inch glass tube)
- Wavelength: 254nm UVC
- Compatible Systems:
- Laguna Pressure-Flo 3000 (PT1727)
- Fluval Pressure-Flo 3500
- Certain Laguna Clear-Flo / Pressure-Flo 14000 setups (PT1737/PT1738
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On Sale Today!

A Replacement bulb for the Little Giant 9-Watt UV-Light Clarifier.
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Product Details & Compatibility
- Part Number / MPN: PT1607 (Barcode: 015561216074)
- Compatible Systems: Laguna Pressure-Flo 3000 High Performance Pond Filter and select Pressure-Flo / Clear-Flo 14000 models.
- What is Included: One replacement quartz sleeve and two matching O-rings for a water-tight seal.
- Function: Encloses and protects the UV lamp while allowing ultraviolet light to pass through to clear green water and control algae
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The Laguna 8-watt UV Lamp (PT521) is an 8-watt T5 replacement ultraviolet bulb designed for the Laguna PowerClear 1000 UV Sterilizer/Clarifier (PT520) .
Key Specifications & Compatibility
- Wattage: 8 Watts
- Bulb Shape: T5
- Compatible Unit: Laguna PowerClear 1000 UV Sterilizer/Clarifier (PT520)
- Function: Destroys single-celled algae and harmful microorganisms inside the UV chamber without leaving chemical residue in pond water.
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Tetra Quartz and O rings. The quartz sleeve acts as a waterproof barrier separating the internal electric lamp from flowing water. These sleeves should be thoroughly cleaned of calcium and debris twice per season or replaced entirely if they show cracks or heavy staining
Fits PFX-UV8000/ PUV12000/ PUV4000 pressure filters and 18 watt clarifiers.
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The Laguna 25-Watt PT1656 (often associated with model number PT-1655 or part number LG321) is a T8 germicidal UV-C replacement bulb . It is specifically engineered to fit the Laguna PowerClear Max 2000 UV Clarifier/Sterilizer pond filtration system.