Pool pump and filter rules: suction and entrapment

600mm, and the reason behind it

The rule is short. Detailed drawings must show the location of all suction points, including solar suctions, to demonstrate that they will not be less than 600mm apart.

The reasoning is about what happens when one of them is covered. A recirculation pump does not stop pulling when a suction point is blocked — it pulls harder, and the force at the blockage rises. Entrapment happens when a body, a limb or hair covers a suction point and the full pump draw concentrates on it. Two suction points far enough apart mean that blocking one leaves the other drawing freely, and the force at the blockage never reaches a dangerous level.

Six hundred millimetres is the separation that keeps a single body from covering both. The detail that catches builders is the phrase “including solar suctions”: a solar heating system draws its own water, and its suction counts. A pool designed with compliant main drain spacing can be made non-compliant by adding solar heating later with a suction point in the wrong place.

The second half of the requirement is the covers themselves. The active main drain and outlet covers must be detailed, or the permit must note that the outlet covers to be installed will be marked as tested in accordance with AS1926.3-2010 Appendix A. Testing is performance-based, and the marking is how the surveyor verifies it without dismantling anything. If you are in a position to look, look for the marking.

It applies to alterations, not just new pools

AS1926.3-2010 Water recirculation and filtration systems applies to all new and significantly altered pools. Part 3.9.4 of the BCA 2010 first referenced it, and it was adopted by the BCA 2011 on 1 May 2011.

Those two facts together define who this page is for. If your pool was built after May 2011, the standard applied when it was built. If your pool is older but you are about to significantly alter it — a full re-plumb, a new filtration system, a renovation that opens up the hydraulics — the standard applies to the altered work, and the pre-2011 arrangement you are replacing is not a benchmark.

This is the most useful thing to know before commissioning a renovation. An older pool may have a single main drain, which was ordinary once. Work that touches the hydraulics is the moment that gets brought up to the current standard, and it belongs in the quote rather than appearing as a variation. Getting comparison quotes that specify the suction arrangement in writing is how you find out whether a cheaper renovation price has simply left it out.

A building permit application for a pool needs to include drawings of the recirculation and filtration system sufficient for the surveyor to determine that the work will comply, and the surveyor has discretion to ask for more depending on the complexity of the system. The VBA is explicit that “it is not acceptable to have plans with limited or no detail that only refer to compliance with AS1926”.

The trade boundary that surprises everyone

Here is the finding most pool owners — and a fair number of builders — get wrong.

Connecting the pool's recirculation and filtration pipework is not plumbing work in Victoria. The Plumbing Regulations 2008 do not define the connection of recirculation and filtration system pipework as plumbing work, and therefore it is not required to be undertaken by a licensed or registered plumber. Building surveyors are not required to seek plumbing certificates for pool and spa pipework connections.

The designs still have to be given to the surveyor as part of the building permit application — the design is regulated even though the connection work is not licensed. The safety control sits in the design and the covers, not in the trade licence.

The boundary is real, though, and it is worth knowing exactly where it falls:

• Recirculation and filtration pipework, pumps and filters — not plumbing work, no licensed plumber required.
• Drain pipes connected to the sewer — plumbing work, licensed plumber required.
• Connection to stormwater drains, in the circumstances where a water authority allows it — plumbing work, licensed plumber required.
• A compliance certificate is needed where the cost of the connection to the main sewer is more than $750.

So the useful question to a builder is not “is your plumber licensed” but “who is doing the sewer or stormwater connection, and will I get the compliance certificate for it”. That is the part where a licence is legally required and a document should follow.

Before handover: the blockage check

One obligation sits right at the end of the build and is easy to let slide, because by then everyone wants to fill the pool.

The surveyor must satisfy themselves the pool or spa has been built in accordance with the documentation approved as part of the building permit, and may also ask for the pool or spa to be tested to ensure that no pipes have been blocked during construction. Separately, pool and spa builders must satisfy themselves that no blockages have occurred in the suction pipes prior to handover.

Blockages during construction are not exotic. Pipework sits open on a site for weeks with concrete, sand, render and debris moving around it. A partially blocked suction line is also the condition that makes the entrapment risk worse, because it concentrates draw on whatever is still flowing — which is precisely what the 600mm separation exists to prevent.

It is a reasonable thing to ask about at handover: has the system been tested for blockages, and are the outlet covers marked as tested to Appendix A? Both are questions the builder should be able to answer immediately. What to ask a pool builder covers the rest of the handover list.

Where the equipment sits matters for the barrier too

One more rule connects the plant to the fence, and it catches small sites.

For an above-ground pool, the wall can form part of the barrier where it is at least 1.2m above finished ground level and non-climbable — but the pool still requires a safety barrier to protect the ladder access, the pump and the filter, and that barrier must be 300mm clear of any part of the ladder, pump, filter or any other climbable object.

Three hundred millimetres of clearance around the plant is more space than most people leave, because pumps and filters are normally installed tight against the pool to keep the pipe runs short and the hydraulic losses low. The two design pressures pull in opposite directions, and the barrier rule wins.

The same principle applies to in-ground pools in a looser form: pumps, filters and heaters are climbable objects, and a climbable object next to a barrier is a problem regardless of what it does. Plan the equipment location and the barrier line together rather than in sequence. Non-climbable zones explained covers the general rule, and pool running costs covers what the equipment costs to run once it is in.

Common questions

Sources

• VBA Practice Note 05-2018 — Swimming Pool & Spa Safety
• Australian Standard AS 1926.3-2010 — Water recirculation and filtration systems
• Plumbing Regulations 2018 (Vic)
• VBA Practice Note 05-2018, as published by Mornington Peninsula Shire

General information only, current at 2026-09-16. Pool rules differ by state and by council, and penalty amounts are updated regularly. Confirm your own obligations with your council or a registered inspector before acting.