TERMITE MANAGEMENT
Termite reticulation system injection: how the refill actually works
Many Sydney homes have a network of hidden pipes around the slab whose only visible sign is a small junction box at ground level. Every few years those pipes need recharging with fresh termiticide — a precise, label-driven job rather than a quick splash of chemical. Here is what the visit actually involves.
A termite reticulation system is a buried network of perforated or porous pipes placed around a building's slab edge, service penetrations and sometimes beneath the slab or inside wall cavities. The pipes connect to small junction boxes — also called flush ports — that sit at or just above ground level. When the termiticide needs refreshing, a licensed technician pumps fresh emulsion through those ports, and the pipework distributes it evenly into the treated soil without any re-digging, drilling or disturbance to the garden.
What a termite reticulation system actually is
Think of it as a permanent, refillable delivery network built into the termite barrier. During construction — or as a retrofit — flexible pipe is laid in the treated zone around the foundation. Depending on the system, the pipe either has engineered emitters moulded into it, precision perforations, or a porous wall that allows liquid to seep out along its length. Each run terminates at a junction box, which divides the perimeter into zones and gives the technician a sealed point to attach a pump.
Well-known certified systems in Australia include Termguard, Altis and similar AS 3660-certified products. The point of the design is simple: once the pipe is buried, the chemical can be topped up for the life of the building without ever opening the ground again.
Why the chemical has to be replenished
No soil termiticide lasts as long as a house. Over the years the active constituent breaks down through microbial activity, moisture movement and weather, and the treated zone gradually loses the concentration needed to stop termites. The National Construction Code and the AS 3660 series recognise this: where a chemical barrier is inaccessible — under a slab, beneath paving or inside a cavity — a reticulation system is required so the chemical can be replenished.
Without replenishment, a home can appear protected while its chemical barrier has quietly expired. Termites explore constantly, and a zone that was lethal five or ten years ago may no longer be.
When a refill is due
The correct interval comes from two places: the registered product label and the service warranty provided by the pest manager. Labels state an expected protection period for each situation and rate — for some reticulation treatments in Sydney this can be as long as ten years, while shorter periods apply to other zones, rates and products. Many service warranties are shorter than the label life. Whichever date is earlier governs when the system should be recharged.
The certificate issued after each treatment records the product, the rate and the next replenishment date. If you are not sure when the system was last charged, that date — or a sticker on the meter box or in the subfloor — is the reliable place to check, rather than guessing.
What the injection visit involves
A replenishment visit is methodical. The technician is not pouring chemical down a hole; they are re-establishing a complete, continuous treated zone at the exact concentration the label requires.
- Locate and open each junction box, inspect the system and confirm which zones are connected.
- Mix the termiticide emulsion at the label dilution, using measured product and clean water.
- Pump the emulsion through each zone at low pressure until the required delivery volume has been applied.
- Check for even distribution, backflow or blocked runs, then seal and replace the junction box covers.
- Complete and sign a replenishment record — a termite management certificate — for the owner's building records.
Volumes are calculated rather than guessed. Label guidance for perimeter barriers works out to roughly 100 litres of emulsion per cubic metre of treated soil, which equates to about 5 litres per linear metre for a standard 300 mm × 150 mm vertical barrier. A single junction serving a ten-metre run can therefore take around 50 litres, and a typical whole-house replenishment commonly lands somewhere around 100 litres in total, depending on the layout.
No excavation, lifted pavers or drilling on a properly installed system.
Even, controlled distribution through engineered emitters or perforations.
Written certification recording product, rate, volume and the next due date.
Products and rates: a recent Sydney example
On a recent replenishment visit in South West Sydney, we recharged a Termguard reticulation system on a home completed a few years earlier. The product used was Bifenthrin Aqua (David Grays), with an active constituent of 100 g/L bifenthrin and APVMA approval number 62051/0208. For reticulation systems south of the Tropic of Capricorn, the label rate is 1 litre of product per 100 litres of water, with an expected protection period of at least ten years.
Around 100 litres of mixed emulsion was delivered across the system, the junction boxes were resealed, and the owner received a signed replenishment certificate. In this case the service warranty provided was three years, and a reminder is set for the next recharge before that date.
Every property is different: the product, dilution, treated zones and warranty are always taken from the specific label and the on-site assessment — never from a generic online table.
Why this is not a DIY job
Soil termiticides used through reticulation systems are restricted chemical products that may only be supplied to, and applied by, authorised persons.
- A concentration below the label rate fails to establish a continuous barrier; concentration above it is unlawful and wasteful.
- Certified systems must be charged in accordance with AS 3660 and the manufacturer's specifications; otherwise the installation certification — and any warranty — does not hold.
- Pump pressure, delivery volumes and backflow prevention all require proper equipment and training.
- The technician is also checking whether the barrier has been disturbed or bridged, which is often the more important finding of the visit.
What the property owner should do between visits
A reticulation system is largely maintenance-free, but a few owner habits make the difference between a barrier that lasts and one that fails early.
Keep junction boxes accessible — do not pave over, bury or garden-bed around them.
Never excavate, drive posts or lay new paving along the slab edge without telling the pest manager.
Arrange a termite inspection at least once every 12 months.
Keep the certificate with the building records and note the next replenishment date.
Additions, pergolas, new garden beds or landscaping that disturb the treated zone should always be treated and certified again — a disturbed barrier is one of the most common concealed entry points we find.
DUE FOR A RECHARGE?
Text us your suburb and a photo of the junction box. We will confirm when the system is due.
We can also check the existing certificate or site sticker and quote the replenishment.