Magnetic filter position?

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17 May 2026
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Hi.
This is my first post so please be gentle!
We recently moved into a new house and the central heating system was almost not working. We had a plumber round who recommended a power flush. We did this and he said it was one of the worst he had seen. He recommended another clean next year.
Having researched online I've found that our best bet now is to fit a magnetic filter. I'm struggling to figure out where a magnetic filter could go on our heating system. We have an oil boiler. The return pipe goes into the top of the boiler, and there is only an 18cm ish gap between the top of the boiler and the ceiling. I saw the Adey vortex 250 filter which is good for compact spaces, and might just fit. I then saw the return pipe above is a 28mm pipe, and the vortex 250 fits 22mm pipe. I am unable to find a suitable filter to fit here so was thinking the airing cupboard is the next option.
I have attached a pic. We have an extension so there are 2 return feeds going into a single boiler return pipe (all 22mm) in airing cupboard. I have attached a pic. Red vertical arrow is boiler feed pipe, red horizontal arrows are 2 central heating feed pipes. Blue arrows are central heating returns and boiler return pipe. My questions are:
1. Where would be the best place to install a magnetic filter? Could I extend the 2 central heating return pipes upwards to create a big enough gap between them and the main boiler return to fit a filter?
2. The yellow arrow. Is this a bypass valve? If yes, can the filter go before this or does it need to go after this?
Thanks in advance for all advice.
 

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