VEVOR UV Water Purifier Sterilizer Filter, UV Light Water Filter for Whole House Water Purification, 12GPM 110V 55W, 3 UV Lamps + 2 Quartz Sleeves

We do not sell parts separately. All our products have a 12 month warranty and if there is a problem with your purchase during the warranty period, we can send you a replacement part free of charge(In the case of parts that are not consumable). Please click the following link to contact us: https://www.vevor.com/pages/contact-us.

It is always on, not triggered by water flow.

No, it doesn't tell you when you need to change the bulb. The normal service life is 8k hours, the replacement time can be calculated by yourself.

It is C-band, and around 254nm

It stays on after being powered on.