Cleaning central heating

diycooper · 20 Jan 2017

My central heating system did not look dirty and had inhibitor in system , however I was still noticing rust around valves etc. I decided to clean it. First I took a read of central heating water with a TDS tester and it was 350. My tap water was 150. I understand it has to be within 10 percent of tap water. I added Fernox F3 and left in for 8 days and mains flushed today. I have now refilled and bled system. Then took another test of central heating water after I run it for 1 hr. The test cam back at 250. Does this mean I should add Fernox again and repeat to get it inbetween 135 - 165 ?

Thanks

diycooper · 20 Jan 2017

No one know how to TDS test then ha ha.

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Cleaning central heating

diycooper

diycooper

DIYnot Local

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