I'd added some X400 sludge remover in my CH system in preparation for doing
some work on it.
The job has now got more complex and I will be getting a professional in to
do the work, which will probably take weeks if not months to find someone.
Can I leave the sludge remover in (the system already had inhibitor in it)
or should I flush it all out and refill with clean water and new inhibitor?