Ecosol Rain Tank

The Ecosol Rain Tank is designed to store non-potable rainwater from impervious surfaces in commercial, industrial, and residential developments.


The EcosolTM Rain Tank is designed to store non-potable rainwater from impervious surfaces in commercial, industrial, and residential developments.

The EcosolTM Rain Tank unit is designed for use on high-density residential and commercial sites where re-use of the rainwater is both viable and desirable. By reducing our dependence on mains water we can cut water-usage costs over time and quickly provide a positive return on the initial capital investment.

Key features

  • internal filtration system to improve water quality
  • controlled inlet reduces re mobilisation of settled solids
  • fail-safe overflow siphon to discharge excess flows
  • back flow valve prevents pollutants entering the unit
  • under ground storage reduces bacterial/algae growth
  • visually unobtrusive
  • easily accessed for inspection and cleaning

The EcosolTM Rain Tank system is delivered to site fully self contained and fitted with an internal filter. It also has a controlled inlet device to reduce remobilisation of settled solids and manage flow velocities and, as with all the EcosolTM units, it has an overflow mechanism that enables the unit to discharge excess flows.

The fitted backflow valve prevents rainwater from travelling back into the unit. An optional pump with floating intake and controller can also be supplied to reticulate the stored stormwater at pre-determined volumes onwards to its destination. The unit is available in four different sizes ranging from 3,000 litres to 25,000 litres and is supplied with trafficable, solid-top sealed access covers that provide easy access for cleaning and maintenance. The unit is designed for use on high-density residential and commercial sites where re-use of the rainwater is both viable and desirable.

The EcosolTM Rain Tank is a durable pre-cast concrete unit designed specifically for rainwater storage and re-use. The system is designed to filter and store, ready for re-use, rainwater run-off from building roofs and other impervious surfaces.

The unit comes complete and fully-contained ready to reticulate retained rainwater to gardens, parks, and also for use in flushing toilets, filling washing machines, and washing down vehicles. It enables our dependence on mains water for non-potable applications to be significantly reduced, potentially by more than 50% and even up to 90%.

The system is designed specifically for underground storage of stormwater maximising above ground land use and is an ideal solution for high density housing developments and commercial sites installed under hardstands and car parks.

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Under Construction



Key Dimensions

Ecosol-Rain-Tank-5The EcosolTM Rain Tank is designed for use on high-density residential and commercial sites where rainwater re-use is viable and desirable. The unit is installed underground providing environmentally-friendly and safe rainwater storage, which helps reduce the risk of contamination from bacteria and algae growth.

The EcosolTM Rain Tank consists of a pre-cast concrete pit containing a secondary filter that removes fine sediment from flows. Primary filtration usually takes place upstream of the unit using one of Ecosol’s primary pollutant filters. This helps prevent the pollutants conveyed in the rainwater run-off from entering the unit.

The EcosolTM Rain Tank also has a controlled inlet device to reduce remobilisation of settled solids and manage flow velocities and, as with all Ecosol units, it has an overflow mechanism that enables the unit to discharge excess flows. A backflow valve prevents the rainwater from travelling back into the unit.

The unit comes with a pump that has a floating intake valve and a controller that are used to reticulate the stored water to its destination at predetermined volumes. Trafficable, solid-top sealed access covers provide easy access to the unit for cleaning and maintenance.

One of the key benefits of the EcosolTM Rain Tank is that it is self-cleaning and, therefore, largely maintenance free. Periodic inspections are usually all that is needed. The unit comes in a range of sizes with all internal pipes and fittings included to suit the site-specifics. Together with an upstream primary filtration system the EcosolTM Rain Tank provides environmentally-friendly cost effective and efficient rainwater, re-use solution.



1The height excludes riser and access cover edge thickness.

The quoted storage capacities includes air space tolerances of 350 mm from the underside of the cover slab.
The above figures assume that the inlet, and overflow, pipe diameter is 100mm.
The maximum inlet pipe diameter is 225mm.

To increase the EcosolTM Rain Tank's total storage capacity and ensure optimal retention of rainwater, multiple units can be installed and connected to each other subject to available space on site. Contact your local Ecosol office for site-specific sizing and product performance specifications and designs.

Key Components

All EcosolTM Rain Tanks are supplied with the following components factory

Tank entry and exit connections
This includes 100mm to 225NB (mm) PVC pipe sleeves, couplings and 50mm electrical conduit sleeves.

Optional external primary filter, if required - note that this item is not included in the quoted price and a separate quote must be obtained. External primary filters can remove and retain from stormwater flows a variety of pollutants such as gross litter, free oils, and grease. They can also remove fine silts and sediments including total phosphorous and total nitrogen. Ecosol’s preferred primary filtration option would be one of its tried and tested systems such as the EcosolTM Storm Pit or the EcosolTM Litter Basket.

Controlled inlet device
This controls the inlet velocities into the storage tank thereby significantly reducing the likelihood of re-suspension of any finer particles that may have passed through the primary and secondary filters.

Back flow valve
This prevents ingress of stormwater and contaminants into the storage tank from high-tail waters. It consists of a 100mm polypropylene in-line, one-way valve.

Overflow siphon
This device constantly removes floating pollutants, such as pollen, from the standing surface water level when the maximum water-holding capacity within the unit is reached. It also discharges excess rainwater from the storage tank and its unique design also prevents rodents from entering the unit via the stormwater outlet.

Selection of the most-appropriate pump is essential to ensure that the system extracts sufficient volumes of water at pre-determined rates and times relevant to usage design and expectations. It is also important to ensure the pump selected provides the end user with a cost-effective, low maintenance system. The Ecosol Rain Tank is generally supplied with a submersible pump, float switch-operated 240 volt centrifugal, multi-stage, twin-impeller design. Larger above ground pump systems are also available depending on the application.

Floating pump intake
This device floats within the tank just below the water surface enabling the cleanest water to be extracted by the pump. It is also fitted with a filter and check valve.

Selection of the controller unit is an integral part of the overall design efficiency of the unit. The controller ensures water is extracted to the minimum water level and at predetermined volumes. It will automatically switch between the available rainwater supply and mains water so there is no need for customer intervention It also provides an option for mains water top up, if necessary (240v 42LMP with built-in check valves).

Purpose-built tank
It is essential with the unit design that all necessary fittings are supplied and that the tank caters for these fittings, both internally and externally. The Ecosol Rain Tank is supplied complete with all the necessary components, pipe connections, and fittings already fitted to ensure a safe and quick installation and reduced on-site cost.

Access covers
The access covers are designed specifically for use in stormwater and suit Class D loading capacities. Each access cover supplied is:

  • Suitable for use in marine environments
  • Designed for a dynamic load factor of 2.0 and 1.5 ultimate LSF
  • Designed to comply with ultimate loads of Class D (210kN)




























The EcosolTM Rain Tank systems are supplied as complete fully self-contained underground water supply systems for nonpotable applications. Ecosol representatives can assist you in the selection of the most appropriate systems for your next project. However as a general guide please refer to the below table for approximate unit sizing.

All EcosolTM Rain Tanks systems are designed to suit trafficable (Class D) loads.



Primary & Secondary Treatment of Stormwater Run-off

Typical urban catchments with large impervious surfaces often convey pollutants such as heavy metals, hydrocarbons and sediment to the drainage network. When installing an EcosolTM Rain Tank in this environment it is recommended that stormwater is pre-treated prior to entering the rainwater harvesting and re-use system. The installation of systems such as the EcosolTM GPT or the EcosolTM Storm Pit will significantly enhance the quality of water stored within the system and increase the operational life of the internal re-use pumps, filters, and associated fittings. For further details on the range of pre-treatment systems available please refer to the primary, secondary and tertiary product sections of this website.






Ecosol Rain TankTo ensure continued access to good quality water for reuse, your EcosolTM Rain Tank must be adequately maintained. The quality of water retained in the tank can also be influenced by a number of factors including the condition of the catchment area (roof and impervious ground surfaces), and vehicle or heavy industry emissions.

To maintain your rainwater harvesting system ensure that the:

  • Internal components are regularly inspected (halfyearly) and serviced (annually) to ensure they are clean and free from corrosion or material build up and are operating to their designed specification
  • Catchment area conveying rainwater to the tank is clean and in good condition - this includes the regular removal of any debris from the catchment area
  • Primary and secondary filters are regularly checked and cleaned, when required
  • Overflow siphon devices are clear of all debris
  • Pump is regularly serviced in accordance with the manufacturer’s recommendations
  • Access covers and surrounds are in good condition and correctly sealed; and that the
  • Pre-cast tank is de-sludged every 2 - 3 years to remove any accumulated sediment.


Ecosol-Rain-Tank-installationThe EcosolTM Rain Tank is designed to be installed into high density residential developments and commercial and industrial sites where rainwater re-use will significantly reduce dependence on mains water.

It’s simple, yet highly effective design enables the unit to be installed underground in trafficable areas thereby reducing the surface footprint. It can be installed near public toilets, in wash-down bays, and maintenance depots where rainwater harvesting is a viable option.

The EcosolTM Rain Tank can provide water for a number of re-use applications including the:

  • Irrigation of gardens;
  • Filling of ponds;
  • Flushing of toilets;
  • Filling of washing machines;
  • Washing down of trucks and other vehicles; and the
  • Provision of water for industrial processes.

There are many factors to consider prior to selecting the most appropriate rainwater tank for your needs. Our staff can help you with any questions or concerns that you may have and provide the necessary guidance.

Some of the more important factors to consider when choosing your rainwater tank include:

Ecosol-Rain-Tank-installedCompliance with local government and other regulatory requirements and industry standards
Contact your local council and/or responsible government authority prior to selecting your rainwater tank to ensure that it meets their requirements. Also, ensure that the unit’s design complies with all relevant Australian Standards and industry codes of practice. Failure to follow these simple steps could lead to the installation of a system that not only fails to meet regulatory standards but also does not function effectively. Contact your local Ecosol representative for design and planning approval assistance.

Carefully consider the size of tank required
This requires a combination of experience and calculation. As rainfall is a variable and demand changes from season to Ecosol-Rain-Tank-installedseason it is best to contact your local council or a consulting hydraulic engineer for guidance and advice. Information needed includes the use to which the harvested rainwater is to be put, the number of facilities, and head height.

Other factors that may affect unit size include:

  • rainfall intensities, which vary from year-to-year, month-to-month;
  • the size of the catchment area trapping and transporting rainwater to your unit; and
  • space constraints.

It is also important to ensure the volume of water delivered to the unit does not exceed the filtration capabilities of the primary and secondary filters and that it does not exceed the inlet and overflow pipe capacities of the unit. It may, therefore, be necessary to install a diversion structure upstream of the unit to divert excess flows away from it. This also helps reduce the inlet flow velocities improving pre-treatment and detention times within the unit.

Consider the use for the unit
If you plan to connect the rainwater tank to your business for toilet flushing, cold-water washing machine taps, or for use in industrial processes, ensure that you obtain council plumbing approval as this will invariably be required. Ecosol strongly recommends that you conduct regular quality monitoring of the stored rainwater.Ecosol-Rain-Tank-installed

Please note that use of stored rainwater for drinking, food preparation or even produce processing is not recommended as contaminants imported from surface and roof catchments may contain microbial hazards or chemical hazards. Please
contact an Ecosol representative for guidance.

Only use licensed tradespeople to install the unit
Note that all plumbing and electrical connections to the unit must be completed by licensed plumbers and electricians as
warranties usually do not cover plumbing or electrical connections to, and from, the rainwater tank.

Typical application for the EcosolTM Rain Tank includes:

  • High density residential housing such as nursing homes and town-housing developments
  • Shopping centres
  • Public amenities such as toilet blocks, parks and ovals
  • commercial developments
  • industrial developments

Ecosol Rain Tank Installation Guides

EcosolTM Rain Tank 7300 - 71500 - Installation Guide

EcosolTM Rain Tank 72500 - Installation Guide

Ecosol Rain Tank Maintenance Guides

Ecosol Rain Tank Maintenance Guides PDF

Ecosol Rain Tank Technical Specifications

Ecosol Rain Tank Technical Specifications PDF