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? Thanks, David.