inhibitor question

[DaveOC]

Hi, Just had my combi heating system refilled by a plumber, I'm not sure if any inhibitor has been added ( he said it had but I don't think he did ). Is there any way of telling if any inhibitor is in my system. Thanks for any advice.

 

[Mottie]

Drain some system water out - about an inch or so in a cup will do, drop a few bright steel nails in it and see if they have rusted after a few days. Do a control with another inch of tap water in another cup at the same time.

 

[DaveOC]

Thanks will do

 

[ianmcd]

or go radical and buy a proper inhibitor level test kit

https://www.cityplumbing.co.uk/Sent...=361337576f1900bb75eeae0e18116ccb&fo_s=gplauk

 

[Madrab]

Don't worry about it, drain some water out of a rad and add some more.

 

[Mottie]

Can you mix different makes of inhibitor if you don't know what's already in there?

 

[Madrab]

Never seen any manufacturer say that your system would dissolve if you mixed different inhibitors. Ideally you would keep the same but a question to the plumber would remedy that. Really they should leave the container or at least complete, detach and stick on the label from it.

 

[ianmcd]

Never seen any manufacturer say that your system would dissolve if you mixed different inhibitors. Ideally you would keep the same but a question to the plumber would remedy that. Really they should leave the container or at least complete, detach and stick on the label from it.

@Madrab many years ago you got system inhibitor , think was from fernox, was called MB1 and MB2 I think, one for cast heat exchangers and the other for copper and aluminium, if you mixed the two it turned into a hard jelly, apart from that never heard of any modern inhibitors reacting with others, as you said best practice to always use the same