"Doctor Drivel" wrote in message
...

"Andy Dingley" wrote in message
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On 4 June, 08:45, "Doctor Drivel" wrote:
"Andy Dingley" wrote in message

Has anyone opened up a Magna booster and found this pile of mythical
sludge?

It is not mythical, it collects magentite on the magnet. The Magna Boost
is
the best, catching magnetic "sludge" and other solids. It is easy to
remove
the sludge, in the annual service.

If you're de-sludging annually, your inhibition needs looking at!


You are right. But it will catch the stuff if the inhibitor breaks down
or neglected. It also catches solids on commissioning.

Many installers use them on boiler changes to avoid the expensive
poweflush. They flush through with fresh water, and run the pump, then
after 1/2 hour empty, and then another 1/2 hour. They do this as they say
do the electric and tidy up, some plastering or whatever. Many put two
does of X-100 in it and of he homeowner is competent enough tell them to
empty it every moth until clean and top up to 1 bar. They hate call-backs.

Does an inhibited system generate enough
sludge to warrant a magnetic trap?

I theory no. In practice yes. Few are redosed at the correct time. On
boiler changes, which is most of the work these days, they are essential
to catch the sludge hanging about. A power flush never gets it all out.

Is the Magna booster a reasonable trap?
(seems likely enough, although
massively over-priced) Is BG installation
fee reasonable? (seems
equally massive, IMHO).

The unit is made by Spirovent who make industrial units as well. They make
quality products. £250, when unit costs say £110 is fine for a drain down
and refill. That is £140 for the work which can take some time depending
on the system. And you may find they put new X-100 in as well.

I know one installer who puts pressure reducing value on the system set to
1 bar and leaves it open. He puts 2 cans of X-100 and a Magana Boost. He
will instructs the homeowner to empty the filter using a bucket and turning
a tap until only clean water comes through. That way he has no call backs
at all and the customer has a clean system. His get out is that the PRV is
for fillup only and he left it on by mistake.