FREQUENTLY ASKED QUESTIONS
Deciding which rainwater tank is right for you can be as easy as a quick phone call to PTQ so we can explain all your options to help you decide. Here we have included some of the most asked questions customers want to ask about our tanks and range of products but if you still need more information, pick up the phone or send us an email.
Why should I install a rainwater tank?
Rainwater harvesting is environmentally friendly, reduces your reliance on municipal water systems, and can lower water bills. It’s especially useful in areas with water scarcity or during droughts.
How do rainwater tanks work?
Rainwater tanks collect runoff from roofs via gutters and downpipes. This water is directed into the tank where it can be stored. Depending on the system, it may include filtration or purification processes to ensure the water is clean and safe for use.
What types of rainwater tanks are available?
There are several types of rainwater tanks:
- Polyethylene (plastic): Lightweight, affordable, and available in various shapes and sizes.
- Steel: Durable and long-lasting, often used for larger tanks.
- Concrete: Strong and long-lasting but may be more expensive.
- Bladders: Flexible tanks used for temporary or emergency water storage.
How much water can a rainwater tank store?
The size of the tank depends on your needs and the available space. Our plastic tanks can range from around 500 liters to 30,000 litres or more. For instance, a 5,000-litre tank might be suitable for a small household or small garden, while larger systems may be needed for agricultural or industrial uses or to be the sole water supply in a more remote household.
How do I maintain my rainwater tank?
Regular maintenance includes:
- Cleaning gutters and downpipes to avoid blockages.
- Checking the tank for debris and cleaning filters.
- Inspecting the tank’s integrity for cracks or leaks.
- Testing water quality periodically to ensure it’s safe for use if you are regularly drinking from it.
Can I drink rainwater from the tank?
Yes, but only if the tank is properly designed and maintained. In many areas of Australia a household may only have rainwater tanks to supply water and they commonly drink the water. If you prefer, a filtration and purification system (such as UV light or activated carbon filters) can be used to ensure the water is potable.
What is the best location for a rainwater tank?
The best location is typically close to the house or other roofed building and its roof drainage system. It should be on a stable, level surface, away from direct sunlight (to avoid algae growth), and ideally, near the garden or areas where the water will be used.
How do I calculate the size of the rainwater tank I need?
Tank size depends on your water needs, roof size, rainfall levels, and how often you use the water. A common rule of thumb is to calculate 1 litre of water for every square metre of roof area per millimeter of rainfall. For example, a 100m² roof catching 10mm of rain would produce 1,000 litres of water.
How do I filter rainwater for use?
A typical rainwater filtration system includes:
- A “first flush” deviceto capture cleaner water once the roof debris is cleared during rain.
- Mesh filters to remove leaves and debris.
- Activated carbon or UV filters for further purification, especially if the water will be used for drinking and you have never reg rainwater before.
How much does a rainwater tank cost?
The price varies based on size, material, and the complexity of the system. A small polyethylene tank might start at $300, while larger tanks with advanced filtration can cost around $3,500.00 plus you will need to consider the cost of preparing the pad and installation of the tank. For more guidance call us and our expert staff will be able to give you a specific quotation for the tank supply and a “rough guide” on likely other costs.
Do I need a pump for my rainwater tank?
A pump is often required if you plan to use the rainwater for pressure-dependent applications like showers or irrigation. Some gravity-fed systems may work for garden use, but more substantial systems usually need a pump.
Can I use rainwater for my garden?
Yes, rainwater is excellent for garden use because it’s often softer (lower in salts and chemicals) than municipal water. Using harvested rainwater can also reduce your water bills depending on how your water contract is structured.
Do I need permission to install a rainwater tank?
Depending on your location, you may need to apply to your local government for approval, especially if the tank is large or if it affects stormwater runoff. Check local regulations for specific requirements.
How long will my rainwater tank last?
A well-maintained rainwater tank can last many years— While the warranty period may be shorter, the can last typically 20 to 30 years. However, the lifespan of the tank can vary depending on material and care taken to avoid damage such as impacts from motor vehicles or washing away of the foundation pad by persistent leaks.
Is rainwater harvesting legal everywhere?
Rainwater harvesting is legal in most areas, but some regions may have restrictions or guidelines regarding the use of rainwater, especially for drinking purposes. Always check local regulations to ensure compliance.
What are the advantages of using rainwater?
- Cost savings on water bills.
- Environmental benefits such as reducing demand on municipal water supplies.
- Sustainability, as rainwater is a renewable resource.
- Improved plant health for garden irrigation, as rainwater is often better than tap water.
Can rainwater harvesting help in areas with water restrictions?
Yes, it can significantly reduce reliance on the public water supply, especially in regions with frequent droughts or where water restrictions are in place. Rainwater tanks are often seen as a solution to address water shortages.
How do I prevent mosquitoes and algae in my tank?
To prevent mosquitoes and algae in your tank, ensure that all inlets, outlets, and overflows are fitted with fine mesh screens to stop insects from entering, and regularly clean gutters and filters to minimise organic debris entering the system. Keeping the tank covered and minimising sunlight exposure helps deter algae growth, while routine maintenance, such as flushing the first flush diverter and inspecting for leaks, also plays a key role in maintaining water quality and preventing infestations.
Why are polyethylene tanks better to store rainwater?
Polyethylene tanks are favoured for rainwater storage due to their durability, resistance to corrosion, and lightweight design, which makes installation easier compared to traditional metal or concrete tanks. These tanks do not rust or leach harmful substances, ensuring the collected rainwater remains safe for garden irrigation and other non-potable uses. Additionally, their seamless construction minimises the risk of leaks and helps maintain water quality by reducing places where algae and bacteria can thrive. With proper maintenance and screening, polyethylene tanks offer a reliable and efficient solution for households seeking to make the most of harvested rainwater.
Should I get my rainwater tank cleaned out regularly?
Regularly cleaning your rainwater tank is not recommended to maintain optimal water quality. Rainwater tanks have been proven to form their own biome which can allow heavy pollutants to sink to the bottom of the tank and allow clean water above that level. Of course its most helpful to prevent the build-up of sediment, and minimise the risk of contamination from organic matter or animal droppings.
If you rely on your tank for drinking water in your area, you may consider establishing a maintenance schedule that includes inspecting and cleaning your tank every few years, or more frequently if necessary, which will help you get the most from your rainwater harvesting system an ensure water quality for your family.
If you still need answers just pick up the phone, we would be delighted to help.
