42-Watt Replacement UV Bulb for FiltoClear 5200 Filters The Oase 42 W UVC lamp is the direct-fit replacement ultraviolet bulb for the FiltoClear 5200 pressure filter. UV lamps lose germicidal effectiveness over time even when they still appear to glow — replacing the bulb annually ensures the filter continues to kill algae spores and waterborne pathogens effectively. Annual Replacement is Essential UV output degrades to below effective levels after approximately 8,000–9,000 hours of operation — roughly one full pond season. A lamp that appears lit may only be producing a fraction of its original UV intensity. Replacing the bulb each spring, alongside the quartz sleeve, is the most reliable way to prevent green water. Specification Details Wattage 42 W Compatible Model FiltoClear 5200 Replacement Interval Annually (spring startup) Type OEM UVC replacement lamp Installation Disconnect the filter from power. Open the UV lamp access port, carefully remove the old bulb, and slide the new one into the socket. Avoid touching the glass with bare hands — use gloves or a clean cloth. Close the access port, restore power, and confirm the lamp illuminates through the inspection window. Ideal for annual spring UV maintenance on the FiltoClear 5200 — always pair with a fresh quartz glass sleeve for best performance.
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