COLORBOND® Steel Slimline Water Tanks


Unique range of rectangular tanks

After perfecting our original Slimline shaped tank in 1982, we have now created the ‘Slimline Squared’ by ‘squaring’ off the ends of the slimline shape.

Besides maximising your available space and giving a very modern look for any application, the advantage of these tanks is the ability for them to be interlinked in a row of tanks with large diameter connections which allows a more effective water flow.

Our Slimline Squared Range offers you a modern, sleek design to suit any application. Ranges up to 7,000 litres. Custom sizes also available.

PDF file size 578 MB
Our Slimline Steel Water Tanks are Watermark Approved Tanks

Watermark Approved

Our tanks are certified to ATS 5200.026 standards – proof of a tried and trusted tank design.

Our Slimline Steel Water Tanks use Genuine BlueScope Steel on all our Tanks

Genuine BlueScope

Our tanks are manufactured using BlueScope Steel and high-strength Henrob rivets, and sealed with approved food-grade silicon.​

Our Slimline Steel Water Tanks use COLORBOND® Aquaplate Steel on all our Tanks

Colorbond Aquaplate

Our tanks are built with a specialised material from Bluescope Steel called Aquaplate which has a polymer lining that's safe for drinking water.

Our Slimline Steel Water Tanks are Australian-made in Gippsland, Victoria

Australian Made

Each of our water tanks are individually produced in Gippsland, Victoria, under a strict quality control system.

Popular AQUASLIM Squared Tank Sizes​

Below are some of our most popular AQUASLIM Squared tank sizes

Aquaslim Squared 2006 2000 Litres 1.8L x 0.66W x 2.02H
Aquaslim Squared 2008 2000 Litres 1.9L x 0.88W x 1.57H
Aquaslim Squared 2508 2500 Litres 1.9L x 0.88W x 1.87H
Aqualong Squared 3008 3000 Litres 2.25L x 0.88W x 1.87H
Aqualong Squared 5008 5000 Litres 3.0L x 0.88W x 2.17H
Aqualong Squared 5012 5000 Litres 2.5L x 1.2W x 2.02H
Aqualong Squared 7012 7000 Litres 3.4L x 1.2W x 2.02H

For a full range of our AQUASLIM® Squared tank sizes, download our brochure

PDF file size 578 MB

Colour Options​

Choose from a range of genuine COLORBOND colours

Pale Eucalypt®
Pale Eucalypt®
Woodland Grey®
Woodland Grey®
Deep Ocean®
Deep Ocean®
Woodland Grey®
Night Sky®
Night Sky®
Galvanised Steel Rainwater Tanks by Slimline Rainwater Tanks

The colours shown represent actual product colours as accurately as possible. However, we recommend checking your chosen colour against an actual sample of the product before purchasing, as varying screens and devices may affect colour tones and finish

COLORBOND® steel, BlueScope, the BlueScope brand mark and ® colour names are registered trade marks of BlueScope Steel Limited.

Tank Inclusions​

Everything that comes with your AQUASLIM Squared tank


Option of 25mm (standard), 32mm, 40mm, 50 mm, 80mm, 100mm or 150 mm BSP Threaded outlets


Either though the roof of the tank with a mozzie-proof inlet strainer or through the side wall with a PVC spigot


Option of 90mm (standard), 100mm, 150mm, 225mm or 300mm PVC overflows spigots

Retention Orifices

Any size orifice to comply with your stormwater retention requirements

CFA / Firefighting Accessories

Range of CFA Couplings, Storz fittings, vortex inhibitors and Fire Hydrant Tank accessories

Accessories to complement your tank

Pump Kits - including mains changeover kits for toilet/laundry use, Water filters for any application and Tank water level Indicators

Related Tanks​

Not the tank you are looking for? Try our other tank range

Our Slimline Colorbond Steel Water Tanks range are our ‘Slimmest’ Slimline Rain Water Tanks – Ranging from 1,000 to 2,500 Litres.

1,000 to 2,500 Litres

Our range of Aqualong Slimline Tanks are large in volume but still slim enough to fit down the side of most buildings without intruding.

3,000 to 7,000 Litres

Our range of Aquaplate Round Tanks are for those serious about water storage – Volume capacity of up to 25,000L.

1,000 to 25,000 Litres

Scroll to Top