Hydro Jetting vs Traditional Drain Clearing: Which Is Better?

How Each Drain Clearing Method Works

Three clearing methods, three different mechanisms. Here’s how each one works inside your pipes.

How They Compare — Side by Side

A quick-reference verdict on the four factors that matter most. Detailed explanations below.

Effectiveness

Hydro-jetting is the most thorough clearing method available. Because the high-pressure water cleans the entire internal circumference of the pipe — not just a central channel — it removes grease, scale, roots, and debris from the pipe walls. A drain cleaned by a high-pressure jet blaster with a root cutting turbine is left significantly cleaner than one cleared using an electric eel alone. The result is a pipe restored to close to its original internal diameter, which means it takes longer for build-up to reach a critical level again.

Electric eels clear a channel through the blockage, but the build-up on the pipe walls remains. For grease blockages, this means the narrowed pipe re-blocks faster because the grease coating is still in place. For root blockages, the eel cuts through the root mass but doesn’t remove the smaller root fibres clinging to the pipe wall.

Drain rods are effective for surface-level blockages but can’t match the reach, power, or thoroughness of hydro-jetting or electric eels.

Longevity of Results

Because hydro-jetting cleans the full pipe interior, the results last significantly longer than electric eel or drain rod clearing. For recurring blockages caused by grease, roots, or sediment, hydro-jetting provides the longest interval between re-blockages.

Electric eel clearing provides a shorter-lasting result because the pipe walls remain coated. For tree root blockages, roots typically regrow to a blocking level within 6 to 12 months after eel clearing, whereas hydro-jetting with root cutting can extend that interval.

Pipe Safety

All three methods are safe for modern PVC and HDPE pipes when operated by a trained plumber. For older clay, earthenware, and cast iron pipes — common across Sydney’s older suburbs — hydro-jetting requires an experienced operator who can adjust pressure to suit the pipe condition. In the hands of a qualified plumber, hydro-jetting is safe for all pipe types.

Electric eels carry a slightly higher risk of pipe damage in fragile or severely deteriorated pipes, as the rotating metal cable can catch on displaced joints or cracks. Drain rods are the lowest risk option but also the least effective for anything beyond simple blockages.

Cost

Hydro-jetting generally costs more than electric eel or drain rod clearing because the equipment is more expensive to operate and the clearing is more thorough. However, because the results last significantly longer, the total cost over time is often lower than repeated electric eel clearing.

For a detailed breakdown of blocked drain costs in Sydney, including pricing for different clearing methods, read our comprehensive blocked drain pricing guide.

When Each Method Is Used

The right method depends on the blockage. Here’s when each one is the right call.

The Bottom Line

For most blocked drains in Sydney — particularly sewer and stormwater blockages involving tree roots, grease, or recurring issues — hydro-jetting is the superior method. It clears more thoroughly, lasts longer, and restores the pipe to close to its original condition. Electric eels and drain rods still have their place for simpler blockages, but they aren’t a substitute for hydro-jetting when thoroughness and longevity matter.

If your drain keeps blocking despite previous clearing, it’s likely because the pipe walls weren’t fully cleaned — or because there’s underlying pipe damage that needs addressing. A CCTV drain inspection will reveal the cause, and your plumber can recommend the most effective clearing method and whether pipe relining is needed for a permanent solution.

Frequently Asked Questions