What is a microfilter and what kind do I have?

We explain all about what this device is and what it does.

Last updated: 18 June 2018 - 3.56pm

You might not know what a microfilter is, but the chances are you’ve got one in your home. They’re clever little devices that help keep your broadband running smoothly.

Not sure whether you need one or not? This article will explain all you need to know about them and help you make a decision either way.

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What is a microfilter?

A microfilter is a device that plugs into your master socket. It has two sockets: one that connects to your router for internet access, and one that connects to your telephone line.

What does a microfilter do?

It stops broadband and voice signals interfering with each other.

Do I need a microfilter?

It depends on what kind of master socket you have. If your master socket has one socket (as pictured below), then yes, you need a microfilter for every socket that has any phone or broadband equipment plugged in, including your Hub, landline phones, answer machines, digital TV boxes and alarm systems.

Microfilter single socket

If your master socket has two sockets (as below), either next to each other or one above the other, you don’t need a microfilter. Just make sure you plug your Hub into the broadband connection socket, and your phone into the other one. Make sure you get these the right way round, or they won’t work.

No microfilter

How much do microfilters cost?

They’re very affordable and can cost as little as £1. If you need one, check out our range at the BT Store.

How do I fit a microfilter?

It’s simple – it only takes a few seconds. To see how easy it is, watch this video.

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