It is a sound no homeowner wants to hear—the gurgle of a sink that refuses to drain, or worse, the silence of a toilet that is dangerously close to overflowing.  Blocked drains  are one of the most frequent plumbing issues faced by Australian households. They can strike at any time, turning a relaxing weekend into a stressful scramble for solutions. While some blockages are sudden accidents, most are the result of a slow accumulation of materials that simply should not be in