Badly limescaled heating system

[GasmanxxxR1]

Good evening chaps.

Has anyone hade experience descaling a heating system, standard y plan open vented system with a potterton he boiler.

Some numpty put the pump directly above the boiler on the return. The boiler kept locking out every 30 secs and the customer kept resetting it for 2 YEARS!

I removed the pump and it had about 8mm hole the rest was rock solid limescale, the coil in the cylinder wich was piped in 15mm was solid too. Ive powerflushed it with x800 and had it going. But its gone south again. Took the head off the new pump and there was loads of little stones of limescale in the impeller.

Does anyone know if fernox ds3 descaler would work in a powerflush without damaging it or the system.

Any other tips?

Cheers

 

[Rickster123]

Once it's reached that stage I think its repipe time mate to be honest.

 

[GasmanxxxR1]

Once it's reached that stage I think its repipe time mate to be honest.

Think your right, forgot to mention its 8mm micro-bore aswell, dont you just love it.

 

[Rickster123]

Think your right, forgot to mention its 8mm micro-bore aswell, dont you just love it.

Dont even entertain the idea of de scaling it mate. Throwing good money away. Get your quote in quick!

 

[wetdrip]

Micro-bore is poo, anywhere.

 

[IDCHAPPY]

The old orange juice song sounds good:
Rip it up and start again

 

[gasmanrob]

If you know any BG engineers see if you can get fernox sonic clean. It is the dogs dangly bits at shifting scale don't know too many people willing to give it out though. I rescaled a coil on a thermal store this way and it worked luuuvly. You must neutralise it after though that stuff make fx90 look like vinegar

 

[jtsplumbing]

used to get lots of this when I lived in Berkshire, Marlow/High Wycombe very bad, but what you have got is past a de-scale , New boiler Cylinder, pipe work, and push for a water softener

 

[jtsplumbing]

Never found the X800 to be very good needs to stay in system to long, best de-scaler I used was made for Kemco pumps

 

[Ermintrude]

Brick acid 50% then rinse the **** out of it. Use litmus paper to check ph of system. Keep rinsing till nutral. Or same oh as rap water

All else fails new pipework. So not use in alu hex!

 

[BLOD]

DS3 works well on limescale, it's sulphamic acid so won't do anything nasty to copper.
As long as you've got some flow through the pipework it should work although you might have to do the system in sections to keep the solution quite strong.

The guy at fernox told me it's ok to use it in powerflush machines & I've not had any problems yet - I do give the machinbe a good rinse afterwards though