Scale/debris in DHW

[Dusty07]

Good evening,
Can somebody please advise what could be the reason I have scale in my DHW when I run the Bath or use the taps in the sinks. The cold water taps are clear. I have a thermal store and a heat only boiler which is been replaced this week.
I have been informed by homeserve that the boiler HEX is probably chocka with rubbish (17 years old). I had the HEX changed on the thermal store a year ago.
Is the scale issue linked to my boiler which makes quite a racket or something else and if so can a DIY novice like me sort the issue or do I require the professionals to help me.
Any advice greatly received, thank you.

 

[ShaunCorbs]

Dirty radiator system eg sludge

 

[John.g]

The "dirty" DHW should have nothing to do with the boiler/store (if) "dirty" water so even if you get the system cleaned out and install a magnetic filter before new boiler installation you can still end up with the DHW problem IMO.

 

[Ric2013]

If it's a thermal store with heat-only boiler, then the state of the boiler water should not affect the quality of your DHW.