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4,550L Septic Tank - Polymaster

SKU: ST4550
Regular price $3,650.00 $3,499.00
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Delivery available to Zone 1 and selected areas only

Heavy-duty underground wastewater solution for larger households

Dimensions: 3520L x 1640W x 1700H

The Polymaster 4,550L Septic Tank (Model: ST4550) is a robust, low-profile unit designed for households of 6 to 10 people. Fully certified to AS/NZS 1546.1:2008 and approved in NSW, VIC, SA, QLD, and NT, this Australian-made tank is ideal for properties without connection to a sewer system. It comes pre-assembled with fittings and internal baffle, allowing for a fast 10-minute hookup on-site.

4,550L Septic Tank - Polymaster feature set 1

Highlights

  • Pre-assembled 4,550 litre tank – suits households with 6–10 people

  • Certified to AS/NZS 1546.1:2008 for residential wastewater systems

  • One-piece molded body with lifting lugs for safe and easy handling

  • No concrete needed – self-anchoring design holds position in the ground

  • Low-profile shape reduces digging and makes installation faster

  • Made from industrial-grade polyethylene – built to handle tough site conditions

  • 100mm inlet and outlet come pre-fitted

  • Strong, tamperproof lid rated to 500kg

  • Lightweight construction – can be delivered on a ute and placed with small machinery

  • Manufactured in Australia with full local support

  • EPA Approved: BMP650823

  • Approved for use in VIC, SA, NSW, QLD & NT

  • 15-year design life with a 10-year manufacturer's warranty

Specifications

  • Model: ST4550

  • Capacity: 4,550 Litres

  • Dimensions: 3520mm (L) x 1640mm (W) x 1700mm (H)

  • Manhole Diameter: 555mm

  • Approximate Weight: 325kg

  • Material: Industrial-grade polyethylene

  • Inlet/Outlet: 100mm

4,550L Septic Tank - Polymaster drawings 2

Applications

  • Residential homes (6–10 people) in rural or off-grid areas

  • Large family homes not connected to municipal sewer

  • Long-term or temporary wastewater treatment solutions

What’s Included

  • 1 x Polymaster ST4550 Septic Tank (4,550L) – fully pre-assembled

  • 1 x 500kg load-rated heavy-duty lid

  • 1 x Internal baffle

  • 1 x Set of pre-installed 100mm inlet and outlet fittings

  • Built-in lifting lugs for handling on-site

Optional Add-On:

  • 1 x Riser Extension (555mm W x 530mm H) – for deeper burial installations

Delivery Notes

  • Requires suitable lifting equipment (e.g. forklift, small excavator) on-site

  • No crane required – lightweight enough for standard machinery

  • Refer to installation guide for preparation and safety procedures

Approximate Lead Times

  • VIC: 1–2 weeks

  • SA: 1–2 weeks

  • NSW: 2–4 weeks

  • QLD: 2–4 weeks

Downloads

Polymaster Septic Tank Brochure

Polymaster Septic Tank Installation Guide

Polymaster Septic Tank Drawings

Have Questions? Call Our Experts

Call our friendly team at 1300 930 847 or email us at sales@waternex.com.au for expert advice.

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