X900

[hard-work]

Sentinel introduced about 6 years ago X900, which is put into a system and left in, no draining needed. It suspends solids in the system which the filter catches. It is to be used with a magnetic filter/filter which catches the particles, so the filter on a boiler change needs cleaning every few months until the water is clear enough. It avoids having a powerflush.

After 6 years has anyone had experience of X900s performance?

 

[muggles]

I've lobbed it in a couple of systems but it's impossible to say whether it actually works or not - you'd need two identical systems which are identically contaminated, one treated and one not, in order to make any kind of sensible judgement.

 

[JohnD]

not all particles are magnetic.

When I've used X400, and circulated it for a few weeks, most of the sludge is dislodged and comes out in the flush, but the circulating remains continue getting captured in the magnetic filter for some weeks, dying away so that after a few months there is very little showing. If you add inhibitor on final fill, it should not be generating much new sludge unless there is a design or installation fault, such as a leak of pumping over.

If you have reason to believe there is a significant amount of dirt, it seems to me ineffective not to drain it out. A DIY chemical clean is very cheap, and only takes a couple of half-days of effort.

Before you start, you ought to clean out the F&E tank into a bucket, otherwise the dirt will end up in the pipes.

 

[hard-work]

It will be a new sealed boiler in place of an open vent boiler. No problems with circulation. Some filters are magnetic and normal filters, grabbing everything, supposedly. It will be drained of course and flushed, also all rads will be turned off with just one rad at a time open having mains water run through it, then X900 and X400 poured in with the filter cleaned every month or so until the water is clean enough.

 

[JohnD]

It will be drained of course and flushed

So why don't you start the X400 clean on the old pipes and rads prior to the drain and flush?

 

[hard-work]

It is summer. The idea of X900 was that it can be put in the system with X400 and left, with occasional filter cleaning, until all is out.

 

[hard-work]

https://www.diynot.com/diy/threads/sentinel-x400.341370/
This thread was 6 years ago and many are impressed. Any experiences since?