Waste Water Solutions

Managing wastewater correctly is essential for protecting drainage systems, reducing environmental impact and ensuring contaminated water is treated before discharge. Whether you're installing a washdown separator for a commercial vehicle wash bay, a silt trap for sediment control, or a septic tank for an off-mains property, choosing the right solution helps keep your drainage system operating efficiently.

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Showing 21–40 of 73, lowest price first
Atlantis Triple Stage 5400 Litre Washdown Separator
£1,961.55 Exc VAT (£2,353.86 Inc VAT)

2 - 5 Working Days

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Harlequin HydroClear 6 Sewage Treatment Plant | 1–6 Person
From £2,195.00 Exc VAT (£2,634.00 Inc VAT)

3 - 5 Working Days

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Harlequin 2700 Litre Effluent Pump Station - Single Pump
From £2,245.00 Exc VAT (£2,694.00 Inc VAT)

2 - 5 Working Days

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Harlequin 3200 Litre Effluent Pump Station - Single Pump
From £2,355.00 Exc VAT (£2,826.00 Inc VAT)

2 - 5 Working Days

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Harlequin 1550 Litre Sewage Pump Station - Single Pump
From £2,425.00 Exc VAT (£2,910.00 Inc VAT)

2 - 5 Working Days

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Harlequin CAP 9 Sewage Treatment Plant | 6-9 Person
From £2,465.00 Exc VAT (£2,958.00 Inc VAT)

3 - 5 Working Days

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Harlequin HydroClear 9 Sewage Treatment Plant | 7-9 Person
From £2,495.00 Exc VAT (£2,994.00 Inc VAT)

3 - 5 Working Days

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Harlequin 800 Litre Effluent Pump Station - Twin Pump With High Level Alarm
£2,525.00 Exc VAT (£3,030.00 Inc VAT)

2 - 5 Working Days

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Atlantis Single Stage 6800 Litre Washdown Separator
£2,584.30 Exc VAT (£3,101.16 Inc VAT)

2 - 5 Working Days

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Atlantis Triple Stage 7800 Litre Washdown Separator
£2,645.46 Exc VAT (£3,174.55 Inc VAT)

2 - 5 Working Days

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Harlequin 1100 Litre Effluent Pump Station - Twin Pump With High Level Alarm
£2,657.00 Exc VAT (£3,188.40 Inc VAT)

2 - 5 Working Days

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26 Person 6800 Litre Shallow Dig Septic Tank
£2,683.30 Exc VAT (£3,219.96 Inc VAT)

2 - 5 Working Days

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Atlantis Single Stage 8400 Litre Washdown Separator
£2,766.06 Exc VAT (£3,319.27 Inc VAT)

2 - 5 Working Days

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Harlequin 2700 Litre Sewage Pump Station - Single Pump
From £2,775.00 Exc VAT (£3,330.00 Inc VAT)

2 - 5 Working Days

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36 Person 8400 Litre Shallow Dig Septic Tank
£2,865.06 Exc VAT (£3,438.07 Inc VAT)

2 - 5 Working Days

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Harlequin 3200 Litre Sewage Pump Station - Single Pump
From £2,890.00 Exc VAT (£3,468.00 Inc VAT)

2 - 5 Working Days

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Harlequin 800 Litre Sewage Pump Station - Twin Pump With High Pressure Alarm
£2,945.00 Exc VAT (£3,534.00 Inc VAT)

2 - 5 Working Days

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Harlequin CAP 12 Sewage Treatment Plant | 10-12 Person
From £2,995.00 Exc VAT (£3,594.00 Inc VAT)

3 - 5 Working Days

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Atlantis Double Stage 8800 Litre Washdown Separator
£3,007.08 Exc VAT (£3,608.50 Inc VAT)

2 - 5 Working Days

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About Waste Water Solutions

At Online Tank Store, we supply a growing range of high-quality waste water solutions for domestic, commercial, industrial and agricultural applications. Manufactured by leading UK brands, our products are designed for long-term reliability, easy installation and straightforward maintenance.

Our range includes washdown separators, silt traps, septic tanks and sewage treatment plants, with additional products including grease traps, pump stations and underground waste water tanks being added to the range soon.

Whether you're managing vehicle wash water, treating domestic wastewater or controlling sediment before it enters the drainage network, our experienced team can help you select the most suitable solution for your project.

Our Waste Water Solutions Range

Washdown Separators

Designed for commercial vehicle wash areas, washdown separators remove silt, oils and hydrocarbons from contaminated wash water before it enters the drainage system. Ideal for car washes, fleet depots, agricultural machinery cleaning and industrial wash bays.

Silt Traps

Silt traps capture mud, sand, grit and suspended solids before they reach drainage systems, helping to reduce blockages and protect downstream infrastructure.

Septic Tanks

Our septic tanks provide an effective solution for properties that are not connected to the mains sewer network, making them ideal for rural homes, farms and commercial premises.

Sewage Treatment Plants

Sewage treatment plants provide advanced wastewater treatment, producing cleaner discharged water and offering an ideal alternative where higher treatment standards are required.

Whether you're planning a new installation or upgrading an existing wastewater system, Online Tank Store offers reliable products and expert advice to help you find the right solution.