Whats the best road to fix a filter between two metal joint on a boiler?

Does using tavern soap, ultimately clog your drains?
Answers:    give more details ...
I
Whats gonna occur subsequent?
Drain the hose down from the leaking pipe , and use a compression fitting to replace the spot where on earth the leak is. If it is a 15mm pipe, draw from a 15mm compression connector straight. If it is 22mm, the n its a 22mm straight connector.
What's wrong beside my furnace?