Welflos M UV Container Replacement Guide

By Weldental: Water Flosser with Weltip Infuser Tip Delivers | Published: 2026-10-26

Category: How-to Guides

Learn how to replace the Welflos M UV container with our step-by-step guide. Keep your water flosser hygienic and extend its life.

Quick answer

Replace the Welflos M UV container when the UV light dims or the container becomes cloudy. Follow the steps below for a safe, hygienic swap.

Why replace the UV container?

The UV container houses the sanitizing bulb that keeps your water flosser tip clean between uses. Over time, the container can become cloudy or the bulb can weaken, reducing its effectiveness. Replacing it restores proper sanitation and helps your flosser perform like new.

What to consider before buying a replacement

Make sure the replacement container is compatible with your Welflos M model. Check the part number or measure the existing container to ensure a proper fit. Also, consider the warranty: if your flosser is still under warranty, contact Weldental support first to see if the replacement is covered.

How to replace the UV container

Turn off and unplug the flosser: Always disconnect the power before handling any part of the water flosser to avoid electrical shock. Never attempt replacement while the device is plugged in.
Remove the old UV container: Gently twist or pull the container out of its housing. If it sticks, wiggle it slightly – do not force it, as this can crack the housing. Inspect the old container for cracks or damage.
Clean the housing area: Wipe the inside of the housing with a dry cloth to remove any dust or moisture. This ensures a clean seat for the new container. Check that the housing is completely dry before inserting the new container.
Insert the new UV container: Align the new container with the slot and push it in until it clicks into place. Make sure it sits flush with the base. If it doesn't click, remove and reinsert – do not force it.
Plug in and test: Reconnect the power and turn on the flosser. Check that the UV light activates. If it doesn't, the container may not be seated properly. If the light still doesn't work, contact Weldental support for assistance.

Replacement part

Welflos M replacement UV container: Welflos M replacement UV container is available at a catalog price of USD 6.02 (compare at USD 8.99). This affordable part keeps your flosser's UV sanitizing function working, so you don't need to buy a whole new device.
Welflos M replacement UV container