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Flomasta Brass Magnetic (& non-magnetic) Boiler Filter - £55.59 @ Screwfix (Free Click & Collect)
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Flomasta Brass Magnetic (& non-magnetic) Boiler Filter - £55.59 @ Screwfix (Free Click & Collect)

£55.59£8535%Screwfix Deals
14
Posted 26th Jan

This deal is expired. Here are some options that might interest you:

Partially posting to help others, partially posting to see the community plumbers' views as I've seen some negative comments on Fernox filters - the cut-down price tipped this one into my shopping basket.

Apparently they are quite large , but I have a big boiler cupboard housing the boiler.
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14 Comments
These are getting really cheap. Used to be £100 a pop.
I've always wanted one of these.
So what is this for exactly?
kidrock12327/01/2020 00:17

So what is this for exactly?


You put it on the return to the boler and it filters out the sludge, more important for a replacement boiler than a new system but for the cost a no brainer.
For the OP, as a Gas Safe eng, I have not use this model or even seen one when servicing but it looks OK and being all brass should be OK.
Unless your system is heavily corroded with metal particles that are attracted to magnets floating around, this type of filter will not do anything. Note that any corrosion products take years to build up and if this is the case then flushing might be a better option..
Secondly this will not make any difference to particulates introduced through make up water, seal breakdown, biological growth etc which are unaffected by magnetic fields and more of a problem in heating systems.
I have worked in the field of industrial filtration for many years.
Would you recommend any product that is good for all particles? Our Boilers diverter valve fails every two years, possibly due to debris.
Heat.Sink27/01/2020 07:53

Unless your system is heavily corroded with metal particles that are …Unless your system is heavily corroded with metal particles that are attracted to magnets floating around, this type of filter will not do anything. Note that any corrosion products take years to build up and if this is the case then flushing might be a better option..Secondly this will not make any difference to particulates introduced through make up water, seal breakdown, biological growth etc which are unaffected by magnetic fields and more of a problem in heating systems. I have worked in the field of industrial filtration for many years.


I understand that when flushing (using a static chemical drop and draining , not sure about powerfed), even several times in succession it can loosen up particles that may not make it out of the system and then can return through the boiler and lodge in the internals.
Also , I did state non-magnetic too - the water that passes through the filter is also strained through a stainless steel filter.

I've bought a house with quite old radiators and a slightly younger boiler, that surprisingly, works fairly well. I'm going to flush the lot and for the sake of £55 fit this to try and prolong the life of the boiler as I've got a lot of money to spend elsewhere.

I was in a similar situation 11 years ago at my last house but an even older boiler and very old radiators (cast single panels), I took these outside and ran a hose through them - the amount of rusty sludge gravel that came out was unbelievable. A chemical flush and a regular dose of inhibitor and that whole system is still going strong.
Edited by: "davew2011" 27th Jan
kudos1uk27/01/2020 00:23

You put it on the return to the boler and it filters out the sludge, more …You put it on the return to the boler and it filters out the sludge, more important for a replacement boiler than a new system but for the cost a no brainer.For the OP, as a Gas Safe eng, I have not use this model or even seen one when servicing but it looks OK and being all brass should be OK.


Thanks a lot for posting, that's reasuring. I've also found a thread on a plumbers talk forum that shows this filter is sold under a couple of manufacturers (I think Flomasta is screwfix's own brand?) and under the other name they didn't seem to have any complaints.
Edited by: "davew2011" 27th Jan
If you’re looking for a cheap but effective system filter I’d recommend the spirotech spirotrap MB3. I install them regularly and get great results on new and old systems as it’s magnetic. You can regularly get them for around £60 on eBay. Or £69 from spirotech direct.
Wake9327/01/2020 09:45

If you’re looking for a cheap but effective system filter I’d recommend the …If you’re looking for a cheap but effective system filter I’d recommend the spirotech spirotrap MB3. I install them regularly and get great results on new and old systems as it’s magnetic. You can regularly get them for around £60 on eBay. Or £69 from spirotech direct.


That looks really good and a lot more compact than this one. I noticed it doesn't seem to have isolation valves on it, do you just fit your own either side or does it do something clever in the filter?
But warranty cover without one will be affected.
FloMasta used to be my rapper name
davew201127/01/2020 10:06

That looks really good and a lot more compact than this one. I noticed it …That looks really good and a lot more compact than this one. I noticed it doesn't seem to have isolation valves on it, do you just fit your own either side or does it do something clever in the filter?


I don’t fit isolations unlike other filters you don’t take it apart to clean it out. With the boiler turned off, you remove the magnet allowing the debris to become free and fall to the bottom of the filter. Then open up the isolation for the water pressure to push out all the crap into a bucket.
Edited by: "Wake93" 31st Jan
Wake9331/01/2020 08:12

I don’t fit isolations unlike other filters you don’t take it apart to cle …I don’t fit isolations unlike other filters you don’t take it apart to clean it out. With the boiler turned off, you remove the magnet allowing the debris to become free and fall to the bottom of the filter. Then open up the isolation for the water pressure to push out all the crap into a bucket.


Interesting,thanks. I saw a couple of damaged box ones on ebay for £50ish but stuck with the Flomasta in the end. It's well made and caught loads of crap after just one day (with no flush chems in the system yet).
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