Premium-quality quartz crystal T5 four-pin one end germicidal UV bulbs, designed for ultraviolet clarifiers to eliminate green water in ponds and aquariums. These UV bulbs effectively sterilize single-cell algae, keeping your water garden, koi pond, or aquarium crystal clear and healthy. Compatible with the old Laguna Pressure-Flo Filters (700, 1400, 2100, 3200), submersible Pondmaster UV’s, and many more.

• UVC411: 11 watt bulb fits Laguna PressureFlo700 & 1400 Filters
• UVC120: 20 watt bulb fits Laguna PressureFlo 2100 Filter, Pondmaster 20w UV
• UVC25: 25 watt bulb fits Laguna PressureFlo 3200 Filter
• UVC110: 10 watt bulb fits Pondmaster 10watt UV
• UVC141: 40 watt bulb fits Pondmaster 40watt UV