Tree Roots in Pipes

Tree Roots in Drain Pipes: Clear Them & Keep Them Out

Updated July 2026 · 8 min read · Geelong Emergency Plumbing

Tree roots removed from a blocked sewer pipe in Geelong

Tree roots in drain pipes are the defining plumbing problem of established Australian suburbs — persistent, expensive if ignored, and deeply logical from the tree's perspective. Your sewer pipe is warm, wet, rich in nutrients and, once a root finds even a hairline crack, an all-you-can-eat invitation. In Geelong's leafy older suburbs, root intrusion accounts for the majority of recurring sewer blockages. Here's why it happens, what actually clears it, and — most importantly — what stops it coming back.

How Roots Get In (The Three-Step Invasion)

Step one: pipes develop hairline cracks or open joints. This is not a matter of if but when — earthenware and older clay pipes have joints every metre, and reactive clay soil (abundant across Geelong and the Bellarine) flexes them with every wet/dry cycle. Step two: roots detect the moisture vapour escaping from those cracks. Fine root tendrils — thinner than a human hair — find and enter gaps that would be invisible to the naked eye. Step three: the tendrils grow. Roots inside a warm, nutrient-rich pipe grow prolifically, thickening from threads to rope to a dense mass that catches paper, wipes and everything else flowing past. The tree never meant any of this personally; it's just very good at finding water.

Signs Your Drain Has Root Intrusion

Blockages that return every few months after clearing (the cleared blockage is the hole roots grew through, which closes again)
Slow drains that progressively worsen rather than suddenly block
Gurgling from multiple fixtures, especially after rain when water table shifts
Outdoor overflow gully weeping (see our blocked sewer guide)
A camera confirming it — which is the only way to be sure

Clearing Options: What Works, What Buys Time

Electric eel (drain snake) — clears but doesn't clean

An eel cuts through the root mass and restores flow. Fast, relatively cheap, and a temporary solution: the roots grow back through the same crack, usually within 3–18 months depending on root vigour and pipe condition. Fine for low-budget annual maintenance; frustrating as a permanent strategy.

High-pressure hydro jetting — clears and cleans

Jetting with a root-cutting nozzle removes root masses and scours the pipe wall, extending the time before regrowth. Still temporary unless combined with a fix for the crack — roots return to any unrepaired entry point — but the pipe stays clear longer and the flow is restored properly. For heavily infested lines, jetting after eeling removes what the eel left behind. Full detail in our hydro jetting guide.

Copper sulphate — kills surface roots, controversial

Pouring copper sulphate crystals (bluestone) down the toilet or drain kills fine root tendrils on contact and has a mild deterrent effect. It won't clear an established root mass and it's toxic to nearby waterways (not suitable in properties near waterways or with certain soil types). In some councils, stormwater disposal of sulphate-contaminated water is restricted — check local rules before using it. It's a supplement to mechanical clearing, not a substitute.

Root killing chemicals (foaming root killers)

Products containing dichlobenil or similar herbicides foam through the pipe and treat root entry points. Same limitations as copper sulphate: supplements, not substitutes. Effects last months; the underlying crack remains.

The Permanent Solution: Pipe Relining

Every clearing method treats the blockage. CCTV inspection identifies the crack that let roots in; pipe relining seals it permanently. A resin liner cured inside the old pipe creates a smooth, jointless new inner pipe — roots cannot re-enter through a sealed, jointless surface. No excavation required in most cases, and the result lasts decades. It's more expensive than another eel clear; it's cheaper than five years of quarterly call-outs plus the emergency overflow when the mass finally wins completely.

The economics of the decision: if your drain has been cleared twice in twelve months, get a CCTV inspection. The camera shows whether the pipe is repairable with relining (most are) or needs replacement. Knowing which conversation you're in is always worth the inspection fee — and the fee is typically credited toward the work if you proceed.

Geelong-Specific Context

The older the suburb, the more likely the pipes are clay or earthenware — Newtown, Geelong West, Manifold Heights, Belmont and similar areas were built before plastic pipes, and the mature street trees were planted with them. Reactive clay soil around the Bellarine moves with every season, progressively opening joints in buried pipes. It's not bad luck; it's the combination of tree selection, soil type and pipe age that makes root intrusion almost universal in these areas eventually. The question is managed vs unmanaged, not if.

Roots in Your Geelong Drain?

CCTV confirms it, jetting clears it, relining ends it. Licensed drain specialists across Geelong, the Bellarine and Surf Coast — one call covers all three steps.

📞 Call 0491 570 006

FAQs

How do I know if I have tree roots in my drain?

Recurring blockages every few months, progressively slow drains, and gurgling from multiple fixtures are the main signs. A CCTV drain inspection confirms root intrusion and shows the exact location and severity.

What is the best way to remove tree roots from pipes?

High-pressure hydro jetting with root-cutting nozzles clears root masses thoroughly. Combined with pipe relining to seal the crack the roots used, it's the permanent solution rather than temporary clearance.

Does copper sulphate kill tree roots in pipes?

It kills fine tendrils on contact and has some deterrent effect, but it won't clear an established root mass or seal the crack roots entered through. It's a supplement to mechanical clearing, not a standalone solution.

How often will tree roots come back after clearing?

Typically 3–18 months for regrowth after eel or jetting, depending on root vigour and pipe condition. Pipe relining seals the entry crack permanently, so treated roots cannot re-enter through the relined section.