In this guide, we’ll walk you through your underground water storage options and help you decide which, if any, is the right one for you. The average water bill in the UK is set to rise by up to 11% in April, and many consumers are looking to reduce the amount of water they use at home. One way to do this is through the use of underground water storage. From reducing water bills to helping the environment, underground water tanks have numerous benefits.
But how do they work? What types of tanks are there? And how do you install them?
Types Of Water Storage Tanks
When it comes to underground water storage, there are a few different options. The most common tanks include:
- Poly Tanks: Poly tanks are the typical go-to for underground water storage. They are made from polyethylene, a lightweight plastic that is also robust. These tanks are easy to install and make for the most cost-effective option.
- Fibreglass Tanks: Fibreglass water tanks are known for their durability and resistance to corrosion. Along with being resilient, they’re also just as lightweight as poly tanks.
- Steel Tanks: Steel sheet tanks are strong and durable. They often have a Zinc coating applied to the inside, preventing rust and corrosion. They are not the lightest option, but with regular maintenance, a steel sheet tank can last for decades.
How Do Underground Water Tanks Work
Put simply, underground water tanks collect rainwater from a property and store it for later use.
Rainwater from a property's roof is diverted into the tank via a filtration system, which removes debris and other impurities. Once in the tank, the water is treated to make it safe for use. This can involve various processes such as filtration, UV, and chlorine treatments.
When the water is needed — when a toilet is flushed, the dishwasher is switched on, or it's time for a load of washing — it is pumped from the tank via a submersible pump.
By using the stored water, your tank is an eco-friendly way to reduce your water bill and ease the strain on the public water supply.
How To Install An Underground Water Tank
Installing your water tank requires planning, preparation, and professional help. But with the correct equipment and know-how, it’s a simple task.
Here are the basic steps for installing an underground water tank:
- Get permission: You’ll need to check for the most recent guidance from the UK government’s Environment Agency. More often than not, you’ll need planning permission to install an underground water tank.
- Choose the location: Choose a place for your water tank. You’ll need to consider the tank's size, accessibility, and how much water you need to store.
- Excavate: A pit will need to be excavated for the water tank. It should be slightly larger than the tank and done by a professional.
- Level the base: The pit needs to be level for the tank to work. To level the base, you can use pea gravel or sand.
- Place the tank: Once the excavation is complete, the tank is placed into the hole, and any necessary plumbing and electrical connections are installed.
- Backfill: After the tank is installed, the area around the tank is backfilled with soil and compacted to ensure the tank remains stable.
How To Clean Underground Water Tanks
Cleaning your tank is non-negotiable. This ensures that stored water remains safe and free from any harmful contaminants.
To clean your tank, you’ll need to:
- Drain the tank: Start by draining the tank completely. Use a submersible pump to remove all of the water.
- Scrub the tank: Once empty, it's time to scrub it down. Use a brush or pressure washer to clean the sides and bottom of the tank. After scrubbing, rinse thoroughly with clean water.
- Disinfect the tank: Once the tank is clean and rinsed, it's time to disinfect it. You don’t need anything fancy — use water and bleach. After applying, let the disinfectant sit for at least 30 minutes.
- Rinse the tank again: Once the disinfectant has had time to work, rinse the tank thoroughly with clean water. Use a hose or pressure washer to flush it out.
- Refill the tank: Finally, refill with clean water. This water can be used for any purpose, from irrigation to washing the car.
You should clean your underground water tank at least once a year. However, if it's not been used for a while or you notice any signs of contamination, it's best to clean before using it again.
Benefits of Underground Water Tanks
There’s a reason underground water storage tanks have become a popular choice for homes and businesses. In fact, there are many reasons. The benefits include:
- Saves space: One of the most significant benefits of an underground tank is that they don't take up space. This is useful for properties with limited outdoor space.
- Better quality water: As the water is stored underground, it is protected from harmful UV rays, algae growth, and contaminants.
- Reduces water bills: By storing rainwater, homeowners can reduce their reliance on public water, ultimately reducing their water bills.
- Eco-friendly: Underground water tanks are an eco-friendly way to utilise a natural resource, especially in the UK, where rain is a regular occurrence.
- Reduces flood risk: In areas prone to flooding, water tanks can help alleviate the risk of flooding by storing the excess rainwater.
Water tanks are not for everyone, but they can be an excellent option for many. Whether you’re looking to conserve water, save space, or protect the environment, consider your underground water storage options.
