A surge in advanced technology has paved the way for new methods in tackling blocked drains plumbing, a common household issue that if unchecked, can lead to serious issues resulting in potential water damage and costly repairs. The study emphasizes the latest practices used for unblocking drains, detailing their effectiveness, efficiency, and their impact on the environment.

In understanding the new practices, it is paramount to comprehend the causes of blocked drains. Elements such as hair, soap, dirt, food waste, mineral build-up, and small objects often accumulate over time, resulting in a blocked drain. The new technologies aim to address these issues more efficiently and effectively.

One of the revolutionary strides made in this field involves the use of high-pressure water jetting. Unlike conventional methods that involve using a plumber’s snake or hand augers which could potentially damage the plumbing system, high-pressure water jetting clears the blockage effectively, while preserving the integrity of the pipes. Powerful jets of water dislodge the blockages and clean the pipe walls, removing all debris and build-up, leaving the drain unblocking leatherhead nearly as good as new.

Another innovative technology mentioned in the study is the use of CCTV drain cameras. This technology facilitates the diagnosis of blockages, helping understand what is causing the blockage and where it is located. Such precision aids plumbers in tailor-making a solution that tackles the blockage efficiently, saving time, effort and reducing potential damages.

The emergence of eco-friendly drain cleaners is another noteworthy update. Traditional drain cleaning products have been known to contain harsh chemicals harmful both to the environment and to the pipes. The eco-friendly alternatives utilize enzymes or bacteria to break down the clog, minimally impacting the environment and extending the lifespan of the drainage pipes by preventing corrosion.

The study also emphasizes the rehabilitation of pipes without digging through the ground—trenchless pipe repair—greatly reducing the costs associated with extensive excavation. This is achieved through a method called 'pipe relining,' where a new pipe is created within the existing one, sealing off any cracks or breaks.

In testing the efficiency of these technologies, the study compared the old and new methods based on factors like time taken, effectiveness, cost, and environmental impact. The results conclusively favored modern methods on all fronts.

High-pressure water jetting proved to be faster and more effective than the traditional methods while extending the longevity of the drainage system due to its non-invasive nature. CCTV inspection eliminated the guesswork, reducing the repair time significantly and increasing success rates while minimizing potential damages to the system. Eco-friendly drain cleaners outperformed their traditional chemical counterparts by not just being more effective but also by reducing environmental pollution and enhancing pipe longevity. Lastly, trenchless pipe repair cut down the cost and time significantly, lowering the disruption caused to the property.

In conclusion, the study suggests that the new practices in blocked drains plumbing provide not only efficient and effective solutions but also promote environmentally friendly approaches, highlighting the importance of continually evolving practices for a sustainable future. Therefore, embracing these technologies is beneficial for plumbers, homeowners, and the environment alike, promising efficient and cost-effective drain maintenance.