Hi, I've dosed my central heating system with Fernox F3 cleaner, however, due to the design of the system it is particularly difficult to drain a small part of the system (1 radiator and about 6 metres of 15mm pipe). Does anyone know if draining the rest of the system and refilling/draining a couple of times would leave a safe enough dilution of F3 cleaner that I could add F1 inhibitor and recomission the system?
Thanks!
Thanks!