Magnetic Filter and Inhibitor Checks
The flush cleans the system; the filter and inhibitor help keep it clean. This guide explains magnetic filter cleaning, why inhibitor matters after a flush, and what to check on your own system.
In short
A magnetic filter catches the metallic sludge that circulates in heating water, and magnetic filter cleaning is how you see what the system is producing. Inhibitor slows the corrosion that creates the sludge in the first place. Together they protect a freshly flushed system, which is why both belong in a proper power flush. All power flushing work is carried out by a fully qualified Gas Safe registered engineer.
What magnetic filter cleaning involves
- What it catchesBlack magnetic sludge, mostly iron oxide from corroding radiators and pipework.
- Why cleaning mattersA full filter stops catching debris, so the sludge circulates again and reaches the boiler.
- What the debris tells youHow much comes out, and how fast it refills, is honest evidence of the system’s condition.
- During a flushThe filter is emptied and checked, and the debris removed can be noted and photographed where appropriate.
- If you have no filterWe will tell you whether fitting one would help your system, without pressure either way.
Why inhibitor matters after a flush
- What it doesCorrosion inhibitor slows the chemical reactions between the water, the metal and the air that gets into the system.
- Why after a flushFreshly cleaned metal surfaces corrode fastest, so a clean system without inhibitor starts making new sludge sooner.
- Where suitableInhibitor is added where suitable for the system, and the product used can be noted on your completion record.
- Keeping it topped upInhibitor depletes over time, especially if the system is drained or loses water, so it is worth checking at service time.
Not sure if your filter has ever been cleaned or your inhibitor topped up? Call Regent on 020 8064 2001.
Call 020 8064 2001An honest note
A filter and inhibitor help protect a system; they do not make it immortal. Neither can reverse existing corrosion damage or fix mechanical faults, and no product stops corrosion completely. What they do is slow the build-up down and give you early warning through the filter. Notes about filter and inhibitor work may support your paperwork but do not themselves validate a boiler warranty.
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Common questions
How often should a magnetic filter be cleaned?
Typically at the annual boiler service, and always as part of a power flush. A filter that fills quickly between cleans is a sign the system is still producing sludge.
Is the work carried out by a Gas Safe registered engineer?
Yes. All power flushing work is carried out by a fully qualified Gas Safe registered engineer.
Do I need a filter if my system has just been flushed?
A filter is not compulsory, but after a flush it is the cheapest insurance the system has, because it catches new debris before it reaches the boiler. We will tell you honestly whether one would help.
Is inhibitor included in your power flush?
Yes, where suitable for the system. It is added after cleaning and can be noted on your completion record.
Protect the clean, not just the flush
Call Regent Power Flush London or book an assessment. We will check your filter and water condition and give a clear quote before any work is agreed.