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Thanks Whitespirit66. That possibility was explored in the associated thread referred to in my last post above:- //www.diynot.com/forums/plumbing/is-the-new-spirotech-mb3-the-answer.330345/ Worth a browse for anyone interested in opting for filters, perhaps?

Hi Menaceman. My system seems to be operating as designed now, though we'll have to wait for winter conditns to really put it to the test. The story is pretty well covered in this thread and my conclusion to date is that the problem was caused by the very low flow being produced by the...

Thanks John. In the 6-years+ that my system has been operating, following its upgrading, the F&E tank and pump both seem to have acted very effectively as "filters" for the circulating crud. Yesterday I removed the F&E tank and gave it a thorough clean-out. My plan now is to keep tabs on...

Thanks for that info Tony. I think those dimension rule out my installing a TF1 in my system then. The return pipe to my boiler has a vertical drop-down length of only around 11" (280 mm) from the ceiling to an elbow, from which it reverts to the horizontal to pass alongside and around the...

Thanks - any chance of suggesting how big these "bits" need to be? :) A foot above and a foot below plus the height of the unit (which is what?)? I've never even seen a TF1, and Furnox just don't seem interested. :(

Now why didn't I think of doing that? :oops:

[/url] I wonder if the new x900 is compatible with Furnox inhibitors? Apparently not all Sentinal and Furnox chemicals are compatible, and it may be risky to mix them in the same system.

Still no response from Fernox. :cry: Can anyone here help? I'm looking for the overall height needed, including magnet-access clearance, to install a TF1. The return pipe is quite a short vertical drop from the ceiling to a right-angle bend leading to the rear of the 24HXI Boiler.

Any idea if the Spiro restricts flow more than others, eg the TF1? Or is filtering effectiveness proportional to flow resistance perhaps?

O'rings are used in vast numbers of critical applications though, aren't they? And without adverse effects. I suspect most problems with them relate to applications requiring regular access in servicing etc, in which though the manufacturer recommends fitting a new O'ring each time, few will...

My concern re the TF1 is that as plastics age they tend to become brittle and crack - especially if continually exposed to fluctuating temperatures as in this case. It may take years for this to happen of course. I've been trying to get dimensional details from Fernox on the TF1, but they...

Really? In contact with the circulating water?

Thanks mickyg. It's the plastic of the TF1s that bothers me. Can they really remain trouble-free throughout the life of the boilers they are protecting?

OK John. Maybe my terminology is not that accurate, but it looks rather like a "mesh" in their info doesn't it? I thought the little video I quoted in the root post showed the operation quite well. Did you get chance to look at it? It is towards the bottom LH side of this page:-...

Even if the new magnet doesn't extract much more of the crud from the system, it can't really do any harm I suppose, and its addition does not seem to have increased the price to any great extent. I think my main concern over the Spiratech design in that, unlike a Dyson, it incorpoates an...

It would be nice to see some comparative tests on the effectiveness of the various models, wouldn't it? Do such comparisons exist?

Having experienced deposits in my CH pump recently, I have been ploughing through info on the various filters available with a view to installing one. The Spirotechs seemed to be coming out top of my list, but they didn't have a magnet - until now! Does the new MB3 take the biscuit I...

Thanks JohnD I have now hung jars under both the vent pipe and the feed ball valve in the F&E Tank, so I now await results. A clean out of this tank will have wait until my installation company come back to me about their powerflush conclusions. Is it worth going to the trouble and...

I believe the tank was emptied during the power flushing process, but no attempt made to clean it out. To do so it would need to be disconnected and removed, since it is located up against the rafters in the loft. I'll try and have a go at that John, thanks. The powerflush took most of...

Thanks for all the replies to date. The photo was taken just a few days after the Power-Flush. The rust-coloured deposits around the waterline are similar to those found clogging-up the impellor in the circulating pump. The circulating water is supposed to have been dosed with Fernex F1...