Tabby wrote:

On Dec 4, 12:30*pm, "MrFerrous" wrote:
Apologies for yet another post about a central heating problem.

- There's nothing in the loft to indicate which (if any) inhibitor is
currently in the system. Would something like Sentinel X100 be compatible
with whatever is already in there when refilling?

http://wiki.diyfaq.org.uk/index.php?title=Inhibitor

The OP was asking about compatibility between different inhibitors in
a system, not relative the relative effectiveness in a test.

TF