100% COMPATIBLE MODELS: The S410RL-HO Ü? Bulb is for use in VIQUA VH410, VH410M, SC-410, SCM-410, SPV-410, SP410-HO, and SPV-8 water systems. EFFECTIVE, RELIABLE, AND CHEMICAL FREE: The light water treatment system with special Ü? lamp is an effective, reliable, chemical-free water treatment system that can be used to clean water against most forms of contamination. PREMIUM NON-FLAMMABLE MATERIALS: The lamps for VIQUA VH410 use non-flammable materials and meet system requirements to reduce fire risk. The long-life coating and quartz lamp housing ensure the correct U V dosage, thus guaranteeing the proper treatment and safeguarding your health. The lamps that are used in the Viqua systems have a 18,000 life. LONG LASTING, LOW MAINTENANCE: This high-output mercury vapour lamp for VH410 offers reliability and stability, emitting the most powerful light in a compact design. Once installed, the light cleans the water that flows through it 24/7 and requires minimal annual maintenance to keep it functioning properly. QUICK REPLACEMENT: You just need to plug the eplacement bulb for VIQUA in and finish the replacement. Save your precious time, and at the same time. Those lamps are designed with the proper dimensions, wiring, and specifications to ensure long lasting system operation. 1-YEAR WARRANTY AND AFTER-SALES?YUBEYI team offers 1-year warranty promise, if you encounter any product problems, you can contact us via Amazon email, our professional after-sales customer service team will solve the problem quickly! CAVEATS?Since light travels only in straight lines, any shadows or obstructions reduce its efficiency. This means that the water must be filtered prior to U? treatment to ensure that suspended particles such as sediment are removed. Harder minerals can also build up on the quartz casing and may need to be cleaned when the lamp is replaced, but if the incoming water is hard enough, pre-treatment with a water softener is also recommended to minimise this build-up.