It works i used product in bathtub where water was running out slow water is flowing freely again! Experienced: £, to £,. Hire London boiler repair services now! Great guy! great plumber! jim is smart, funny and reasonable he solves all plumbing problems in a timely manner and does what he says he will he's been our plumber more than years. How can plumbing problems be mitigated? I bought a vaillant boiler from a gas force, their service is simply amazing they have some great products and ideas.