When you call a plumber for a blocked drain, one of the first questions they’ll ask is whether they can use a hydro jet or need an electric eel. For most homeowners, these terms are interchangeable, they’re not. Each method works differently, suits different situations, and has different implications for whether the problem comes back. Here’s a practical guide to both.
The quick answer
Hydro jetting (high-pressure water) is the preferred method for most blocked drain clearing. It thoroughly cleans the full pipe bore, removes grease and scale, and is more effective against root intrusion. An electric eel (drain snake) is a mechanical cable that cuts through blockages; it’s useful where hydro jetting isn’t possible (low water pressure, very fragile pipe, tight access). Most good contractors have both and know when to use each.
What is hydro jetting?
Hydro jetting uses high-pressure water, typically 3,000-5,000 psi, pumped through a hose with a specialised nozzle into the drain pipe. The nozzle configuration varies:
- Rotating chain nozzle: Multiple chains that spin and scrub the pipe walls, used for severe root intrusion and scale
- Penetrator nozzle: A forward-facing jet that penetrates and loosens blockages
- Rear-facing nozzle: Jets aimed backward that propel the nozzle forward while also scouring the pipe walls
What hydro jetting does well
| Application | Hydro jet effectiveness |
|---|---|
| Grease and fat blockages | Excellent, cuts and flushes grease completely |
| Scale and mineral build-up | Excellent, removes hard deposits |
| Root intrusion | Good, removes roots, but they regrow |
| Silt and sediment | Excellent |
| Soft debris blockages | Excellent |
| Hard object (toy, rag) | Poor, may push the object further |
Hydro jet limitations
- Requires water supply, typically a 13 mm garden hose supply on site
- Can damage very fragile pipe walls if excessive pressure is used on AC cement or terracotta in poor condition
- Not suitable for pipes that are completely collapsed (no bore to traverse)
- Can’t retrieve foreign objects, these need to be gripped and pulled
What is an electric eel (drain snake)?
An electric eel, also called a drain snake, drain auger, or sewer rod, is a flexible metal cable with a cutting head that’s fed into the pipe. The cable rotates, and the cutting head physically cuts through roots and breaks up solid blockages. The cable is then withdrawn, bringing debris with it or breaking it up for flushing.
What an electric eel does well
| Application | Electric eel effectiveness |
|---|---|
| Root intrusion | Good, cuts root mass effectively |
| Solid debris blockage | Good, can break up or retrieve |
| Foreign object retrieval | Good, hook attachments can grip objects |
| Limited water access on site | Good, no water supply needed |
| Initial opening of severe blockage | Good, creates a bore for flushing |
| Full pipe wall cleaning | Poor, only the centre of the pipe is cleared |
Electric eel limitations
- Does not clean the pipe walls, leaves root stubs, grease films and scale behind
- Root stubs regrow faster after cutting than original root growth
- Can damage fragile pipe interiors if the cable is used aggressively in old clay or AC cement
- Not effective for grease or fat blockages
- Physically demanding and messy
Head-to-head comparison
| Factor | Hydro jetting | Electric eel |
|---|---|---|
| Root intrusion | Removes roots (temporarily) | Cuts roots (temporarily) |
| Pipe wall cleaning | Yes, full bore and walls | No, centre line only |
| Grease/scale | Excellent | Poor |
| Foreign objects | No (pushes further) | Sometimes yes |
| Pipe safety (old pipe) | Moderate risk if excessive pressure | Some risk from cable |
| Water supply needed | Yes | No |
| Post-clearing result | Clean bore | Passage opened, not clean |
| Ideal follow-up | CCTV to assess for relining | CCTV + possible jetting |
What happens after clearing?
The key insight is that either method clears a blockage, but neither fixes the underlying structural cause of recurring blockages. If you’ve had the same drain cleared twice in three years:
- Get a CCTV inspection to understand why the drain is repeatedly blocking
- Assess whether drain relining is needed to seal root entry points or structural defects
Without addressing the cause, you’re in a cycle of clearing the same drain every 12-18 months indefinitely.
Which method to use in Central Coast drain scenarios
| Scenario | Recommended method |
|---|---|
| First blockage in older clay/terracotta pipe | Hydro jet clear, then CCTV |
| Grease-blocked kitchen drain | Hydro jet only |
| Root-blocked drain in beach house | Hydro jet + CCTV, then assess for relining |
| Foreign object (toy, nappy) stuck in pipe | Electric eel retrieval attempt |
| Pipe very fragile (confirmed old AC cement) | Electric eel to open, then low-pressure jet or manual |
| Emergency after-hours, jet truck not available | Electric eel for emergency access |
| Pre-reline cleaning | Hydro jet (required before liner installation) |
Hydro jetting before drain relining
All drain relining requires hydro jetting as the preparation step. Before a liner can be installed:
- The pipe must be clean, no roots, scale, debris
- The pipe walls must be clear so the CCTV can assess their condition
- Any loose material that could prevent liner adhesion must be removed
An electric eel clean is not adequate preparation for relining. Hydro jetting is always specified.
Safety and pipe condition considerations
On the Central Coast, many pipes are 40-70 years old and in fragile condition. Using the wrong method, particularly aggressive hydro jetting at high pressure in a severely compromised pipe, can cause further damage:
- Fragmented AC cement sections can be pushed deeper into the pipe
- Terracotta with extensive root damage can be split further by pressure
This is why experienced contractors assess the pipe condition (often with a quick preliminary camera check) before choosing their clearing method and pressure setting.
Costs of drain clearing on the Central Coast (2026)
| Service | Typical price range |
|---|---|
| Electric eel / drain snake (residential) | $200, $400 |
| Hydro jet drain clearing (standard) | $250, $500 |
| Hydro jet with rotating chain head (heavy root/scale) | $350, $650 |
| Combined hydro jet + CCTV | $400, $750 |
| After-hours emergency clearing | Add $150, $300 to above |
Frequently asked questions
Which method should I request when I call a plumber? Request whichever is appropriate, but if you don’t know what’s in the pipe, ask the plumber to assess first. If they arrive with only an electric eel and it’s a grease-blocked kitchen drain, you’ll need a jet truck visit anyway.
Is hydro jetting safe for PVC pipes? Yes. Modern PVC in good condition easily handles the pressures used in residential jetting. Old, degraded PVC or PVC with severe root invasion should be assessed first. The contractor will adjust pressure accordingly.
Can I use a consumer-grade electric eel from a hardware store? For simple hair-blocked basin drains, yes. For main sewer blockages or any root intrusion, no, a professional-grade eel with appropriate cutting heads is required, and without a CCTV before and after, you won’t know if you’ve actually resolved the problem.
Does high-pressure jetting kill tree roots permanently? No. Jetting removes the root mass currently inside the pipe. The roots regrow from the cut point, typically recovering to a blocking density within 12-24 months. Only drain relining (which seals the entry point) prevents root regrowth.
How do I know if my old Gosford or Wyong property’s pipe is too fragile for jetting? Ask the contractor to do a preliminary camera check before jetting. If the pipe walls show severe delamination, multiple fractures or near-collapse sections, the contractor will reduce jetting pressure or use a different method. This is standard practice for competent contractors on older Central Coast properties.
Have a blocked drain on the Central Coast? Book a clearing service or CCTV inspection.