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The Diamond DMS range of sewage treatment plants offer a simple, reliable and discreet solution for off mains properties housing 1 up to 20 people. Typical uses include domestic homes and small commercial businesses such as farm shops, B&Bs and glamping sites. The standard tank models come supplied with a weather proof kiosk and low air pressure alarm beacon and blower inside.
The patented Diamond design not only gives you high quality process, but also provides you with a discreet, efficient and cost effective solution for the longevity of the plant.
The DMS2 is suitable for properties housing 1 to 6 persons with a tank capacity of 2270 L. See other capacities here.
Key Features
Longer emptying cycles (up to 3 years desludge) - due to the highly efficient aeration process which breaks down organic matter at a reduced sludge growth rate.
No internal electrical or mechanical moving parts
Handles Seasonal Fluctuations - Efficient performance even at just 10% capacity — perfect for sites with variable occupancy or future growth in mind.
Fully tested, accredited and certified - under European Standard BS EN12566-3 2014 approval which allows a CE mark.
Meets consent standards - of 20mg/l BOD; 30mg/l SS; 20mg/l NH4 as a minimum.
Part H2 UK - of building regulations.
Designed using the British Water Code of Practice Flows and Loads - to ensure that the tank is correctly sized.
Additional published test results:* - total ‘P’ mean average removal 52%, mean concentration 3.8mg/l - total ‘N’ mean average removal 52.2%, mean concentration 25mg/l
Odourless plant
Flushest lids to the ground - creating perfect integration in to the landscape.
Compact in design - keeps the excavation to a minimum and installation simple.
Range of invert depths - for complicated sites, allowing more discharge options
Operating Principle
The wastewater flows into the main tank and enters directly into the bio-chamber. The bio-chamber is a zone where the solids circulate continuously; this is achieved by air rather than mechanical or electrical parts inside the tank.
The draft tube enables the solids to be drawn back up into the central aeration chamber and re-circulated through the treatment process.
The treated liquid then exits through the dip pipe and is discharged safely in to the environment, meeting the required consent standard.
The Diamond DMS range of sewage treatment plants offer a simple, reliable and discreet solution for off mains properties housing 1 up to 20 people. Typical uses include domestic homes and small commercial businesses such as farm shops, B&Bs and glamping sites. The standard tank models come supplied with a weather proof kiosk and low air pressure alarm beacon and blower inside.
The patented Diamond design not only gives you high quality process, but also provides you with a discreet, efficient and cost effective solution for the longevity of the plant.
The DMS3 is suitable for properties housing 5 to 11 persons with a tank capacity of 3030 L. See other capacities here.
Key Features
Longer emptying cycles (up to 3 years desludge) - due to the highly efficient aeration process which breaks down organic matter at a reduced sludge growth rate.
No internal electrical or mechanical moving parts
Handles Seasonal Fluctuations - Efficient performance even at just 10% capacity — perfect for sites with variable occupancy or future growth in mind.
Fully tested, accredited and certified - under European Standard BS EN12566-3 2014 approval which allows a CE mark.
Meets consent standards - of 20mg/l BOD; 30mg/l SS; 20mg/l NH4 as a minimum.
Part H2 UK - of building regulations.
Designed using the British Water Code of Practice Flows and Loads - to ensure that the tank is correctly sized.
Additional published test results:* - total ‘P’ mean average removal 52%, mean concentration 3.8mg/l - total ‘N’ mean average removal 52.2%, mean concentration 25mg/l
Odourless plant
Flushest lids to the ground - creating perfect integration in to the landscape.
Compact in design - keeps the excavation to a minimum and installation simple.
Range of invert depths - for complicated sites, allowing more discharge options
Operating Principle
The wastewater flows into the main tank and enters directly into the bio-chamber. The bio-chamber is a zone where the solids circulate continuously; this is achieved by air rather than mechanical or electrical parts inside the tank.
The draft tube enables the solids to be drawn back up into the central aeration chamber and re-circulated through the treatment process.
The treated liquid then exits through the dip pipe and is discharged safely in to the environment, meeting the required consent standard.
The Tuffa 2500 Litre Plastic Water Tank (Horizontal) is a durable, space-efficient water storage solution designed for applications where height is restricted. Manufactured from rotomoulded, UV-stabilised polyethylene, it offers exceptional strength, corrosion resistance, and long-term reliability across domestic, agricultural, and commercial environments.
This tank has a capacity of 2,500 litres and can be interlinked with additional tanks to achieve higher storage volumes.
The horizontal design makes this tank ideal for installations in sheds, plant rooms, vehicles, or confined spaces while maintaining the same robust performance expected from Tuffa water storage systems.
Key Features
Horizontal tank design – ideal for low-height or restricted installations
Rotomoulded polyethylene construction – seamless, tough, and corrosion-resistant
UV-stabilised and weatherproof – suitable for long-term outdoor use
1″ BSP female bottom outlet – reliable and versatile connection point
Screened vent – protects against debris ingress
8″ inspection hatch / sealed manway cover – easy access for inspection and cleaning
Maintenance-free – no rust, rot, or corrosion
Tough and durable construction the tank is weatherproof and UV resistant
Corrosion resistant and hygienic
Manufactured from recyclable polyethylene
Suitable for domestic, agricultural, commercial, industrial, horticultural, and irrigation applications
Compatible with pumps, rainwater diverters, and additional fittings
Options
Mains fed water kit consisting of ¾” ball float valve inlet and a 2” bye law 30 kit
1″ BSP female bottom outlet of no bottom outlet
Tuffa tanks can be delivered to the side of the vehicle via HIAB for an additional cost.
The Tuffa 10,000L (plastic) water tank is a robust water storage solution suitable for various industries, from agriculture, manufacturing, and construction to sports. The tank is rotomolded with UV-stabilised, seamless and corrosion-resistant polymer making the tank extremely strong and durable.
This tank has a capacity of 10,000 litres and can be interlinked with additional tanks to achieve higher storage volumes.
Key Features
The tank is fitted with a 600mm Inspection hatch and screened vent as standard.
The tank can be fitted with a 2" BSP Female Bottom Outlet, no outlet or a mains fed water kit as required.
Fitted with a sealed manway cover or inspection hatch - easy access for inspection and cleaning
Compatible with pumps, rainwater diverters, and additional fittings
Tough and durable construction, UV-stabilised and weatherproof – making the tank suitable for long-term outdoor installation
Maintenance-free – no rust, rot, or corrosion
Manufactured from recyclable polyethylene
Options
Mains fed water kit consisting of 1” ball float valve inlet and a 2” bye law 30 kit
2" BSP Female Bottom Outlet or no outlet
Tuffa tanks can be delivered to the side of the vehicle via HIAB for an additional cost.
Choosing your Septic Tank
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The right size depends on the number of bedrooms and the likely number of occupants. The general rule is a minimum of 2,800 litres for up to 4 people, scaling up from there. For a 4-bedroom home you'd typically be looking at a 3,800–4,500 litre tank. We've been sizing and installing septic tanks across Cheshire and the North West since 1995, so if you're not sure, just give us a call on 01270 442442 — we're happy to talk it through.
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In most cases, yes, new septic tank installations require Building Regulations approval (Part H) and in some cases planning consent from your local authority. If you're replacing an existing system on a like-for-like basis, permitted development rights may apply, but you'll still need to ensure the new tank is compliant. Systems must also meet the Environment Agency's General Binding Rules for small sewage discharges. We offer a full drainage consultancy service that handles the regulatory side.
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Not anymore, and this catches a lot of people out. Since January 2020, the Environment Agency's updated General Binding Rules mean a septic tank can only discharge to a drainage field (soakaway) in the ground, not directly to a surface watercourse. If your existing tank discharges to a ditch, stream, or river, it's no longer compliant and you'll need to either upgrade to a sewage treatment plant or redirect the discharge to a drainage field. We can survey your site and advise on the most practical and cost-effective solution - get in touch.
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As a general rule, most septic tanks should be desludged once a year by a licensed waste carrier. How quickly sludge builds up depends on usage, tank size, and what goes into the system, things like wet wipes, excessive bleach use, and non-biodegradable products can all reduce efficiency and shorten the time between empties. Keep your paperwork too: the Environment Agency recommends retaining records of all maintenance visits. We can take care of servicing and desludging as part of a maintenance package - contact us for details.
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It depends on your site. Septic tanks are generally the simpler, lower-cost option. However, they require a suitable drainage field to discharge to, and as above, they can't discharge directly to a watercourse. If your ground conditions don't support a drainage field, or if you're close to a sensitive water environment, a sewage treatment plant is likely to be the better fit. We stock both and we'll give you an honest steer on which is right for your situation rather than just selling you the most expensive option. Have a look at our treatment plants range or call the team.
Choosing your Sewage Treatment Plant
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A sewage treatment plant (also called a package treatment plant) provides a higher level of wastewater treatment than a septic tank. Where a septic tank settles solids and discharges partially treated effluent to a drainage field, a sewage treatment plant uses an active aeration process to produce a cleaner, fully treated discharge — typically meeting the Environment Agency's General Binding Rules and suitable for discharge directly to a watercourse or ditch. They are the preferred solution for sites where a drainage field is not practical or where stricter discharge consents apply.
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Sizing is based on the number of persons (PE - population equivalent) the system needs to serve, as well as peak flow rates and the type of use. For most domestic properties, this is calculated from the number of bedrooms. Commercial sites, holiday lets, glamping sites, farm shops, and B&Bs require additional sizing considerations. Our team can size a system correctly for your site - call us on 01270 442442.
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For most new installations, you'll need to comply with Building Regulations Part H and notify the Environment Agency. In England, many domestic sewage treatment plants discharging to ground or surface water are covered by the General Binding Rules, which removes the need for a formal permit, provided the system meets the required standards and is correctly sited. New builds and some replacement installations may still require planning permission. Our drainage consultancy service covers regulatory compliance from start to finish.
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Most sewage treatment plants should be serviced annually by a qualified engineer, with desludging carried out as required — typically every one to three years depending on the system and usage. Regular maintenance keeps the plant running efficiently, protects your drainage field or discharge point, and is often required to maintain your manufacturer warranty. We offer servicing and maintenance across Cheshire and the North West - contact us to arrange a visit.
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We supply sewage treatment plants from trusted UK and European manufacturers including Marsh Industries, Graf, Diamond (WCSEE), and Biorock. Each brand offers different installation and performance characteristics, and we'll help you identify the right system for your site, budget, and access requirements.
Choosing your Water Storage Tank
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A water butt is the simplest option: a compact above-ground container that collects rainwater from a downpipe, ideal for gardens and small outdoor spaces. A water storage tank is a larger vessel, above or below ground, used to store significant volumes of water for irrigation, agriculture, construction, or commercial use. A rainwater harvesting system goes a step further, capturing, filtering, and distributing rainwater for use inside a building, toilet flushing, laundry, and more, reducing your mains water consumption meaningfully over time.
We supply all three, from compact water butts through to large-capacity underground systems holding tens of thousands of litres, from trusted manufacturers including Tuffa, Graf, Marsh Industries, and Garantia. Not sure which is right for your project? Give us a call.
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The right tank size depends on what you're using it for. For garden irrigation, a 100 to 500 litre water butt is usually sufficient. For rainwater harvesting to supply toilets or laundry, you'd typically need 1,500 litres or more, calculated against your roof catchment area and local rainfall. Agricultural and commercial storage requirements vary considerably. We're happy to help you work out the right capacity for your property - give us a call and we'll talk it through.
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The right tank size depends on what you're using it for. For garden irrigation, a 100 to 500 litre water butt is usually sufficient. For rainwater harvesting to supply toilets or laundry, you'd typically need 1,500 litres or more, calculated against your roof catchment area and local rainfall. Agricultural and commercial storage requirements vary considerably. We're happy to help you work out the right capacity for your property - give us a call and we'll talk it through.
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Above-ground water storage tanks require very little maintenance, an occasional clean and inspection is usually all that's needed. Underground rainwater harvesting systems benefit from an annual check of filters and inlet screens to keep everything running efficiently. All the tanks we stock are built to last, and we only work with manufacturers we trust, so you're not going to be dealing with problems down the line. If you do ever need support, we're here.
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Yes to both. We offer nationwide delivery direct to site across mainland UK, and for larger or more complex tanks we can arrange HIAB offload to make things easier on site. We also supply and install underground rainwater harvesting systems across Cheshire and the North West. Above-ground tanks are generally straightforward to position once delivered. Contact us if you'd like to discuss installation.