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💧 20W UVC Replacement Pond UV Tube – 4 Pin Single Ended Aqua-Terra 20 Watt UVC linear tube designed for pond UV clarifiers and pressure filters. Features a 4-pin single-ended ceramic base and measures 355mm (365mm including pins). Compatible with systems that require a 20W 4-pin linear UV lamp, including Laguna Pressure Flo PF8000 and similar units. 🌿 Restores Crystal Clear Water & Controls Green Algae Emits powerful short-wave germicidal UVC radiation (254nm) that disrupts free-floating algae and harmful microorganisms as water passes through your clarifier chamber. Helps restore water clarity and supports a healthier pond environment without chemicals. ⚡ High UV Output for Maximum Filtration Efficiency A fresh UV bulb operates at full strength, significantly improving the performance of your pond filtration system. Over time, UV output naturally declines — even if the lamp still lights — so replacing annually ensures optimal algae control and sterilisation efficiency. 🛠 Durable Quartz Glass with Ozone-Friendly Ceramic Base Manufactured using high-transmission UV quartz glass to maximise UVC penetration. The robust ceramic 4-pin end cap ensures secure electrical contact and reliable performance inside sealed UV housings. 🔄 Simple Installation – Replace Every 6–12 Months Direct replacement design for quick and easy installation. Always follow your filter manufacturer’s fitting instructions. For best performance, replace your UV lamp every 6–12 months, ideally at the start of pond season.