Keep your stored drinking water safe with aeration.

Rainwater storage tank aeration can help reduce the growth of bacteria, algae, and other microorganisms in the water, which can cause it to become stagnant, putrid, and unsafe for human consumption.

The Importance of Water Tank Aeration

Storing rainwater in tanks has become an increasingly popular and environmentally friendly way to conserve water. However, without proper maintenance, the quality of this stored water can deteriorate over time.

One effective method to maintain the purity and safety of your stored drinking water is through aeration.

Understanding the Problem

When water sits idle in storage tanks, it gradually loses its oxygen content. This oxygen depletion creates an environment conducive to harmful bacteria and algae growth. As organic matter accumulates at the bottom of the tank, it forms an anaerobic layer.

These conditions affect the taste and smell of the water and can pose serious health risks if consumed.

The Role of Aeration

Aeration is the process of introducing oxygen into the water. This simple yet effective technique can significantly improve the quality of stored water by:

Preventing stagnation
Reducing bacterial growth
Reducing foul odours and tastes
Increasing the usable depth of water in the tank

How Water Tank Aeration Systems Work

Modern aeration systems, such as AqueousAir™, use subsurface technology to introduce oxygen into the water.

This method is far more efficient than surface aeration, allowing a higher volume of water to circulate faster.

The Aeration Process

A submersible pump injects water while simultaneously drawing air.
The air and water are pressurised and introduced into the tank.
This process circulates and reinvigorates the water, ensuring even oxygen distribution throughout the tank.

Operating an aeration system for approximately one hour daily is adequate for most water tank situations.

Even half an hour of daily aeration during dry periods can prevent anaerobic conditions from developing at the bottom of the tank.

Benefits of Aerating Your Water Tank

Improved Water Quality

Aeration helps maintain the natural balance of your stored water. Introducing oxygen creates an environment where beneficial aerobic bacteria can thrive.

These bacteria outcompete harmful anaerobic bacteria, resulting in cleaner, fresher-tasting water.

Extended Storage Life

Properly aerated water can be stored for longer periods without deteriorating in quality. This is particularly beneficial during dry seasons or in areas prone to water scarcity.

Reduced Maintenance

Regular aeration can decrease tank cleaning frequency and reduce the need for chemical treatments. It also helps prevent the buildup of sediment and organic matter at the bottom of the tank, which, if left unchecked, can lead to more serious contamination issues.

Prevention of Algae Growth

Algae require sunlight and stagnant conditions to flourish. By circulating the water and maintaining proper oxygen levels, aeration systems make it difficult for algae to establish and grow.

This keeps your water cleaner and prevents potential health hazards associated with algal blooms.

Implementing an Aeration System

When considering an aeration system for your rainwater tank, keep the following points in mind:

Tank Size: Choose a system appropriate for your tank’s volume. Some systems can effectively aerate tanks up to 50,000 litres, while others are designed for larger capacities
Energy Efficiency: Look for systems that use energy-efficient pumps to minimise operational costs.
Ease of Installation: Many modern aeration systems are designed for easy installation and require minimal maintenance.
Complementary Filtration: For comprehensive water treatment, consider combining aeration with other filtration methods. For example, a pre-storage filter can remove large contaminants and particles before the water enters the tank.

Best Practices for Maintaining Water Quality

While aeration is a powerful tool for maintaining water quality, it works best as part of a comprehensive water management strategy. Here are some additional practices to ensure the safety of your stored drinking water:

Regular Tank Cleaning: Clean your tank periodically to remove accumulated sediment, organic matter or debris.
Regular Inspection of Water Catchment: Ensure your roof gutters, downpipes and tank screens are free from leaf litter and other organics to prevent contamination from external sources.
First Flush Diverters: Install first flush diverters to prevent the initial, often contaminated, runoff from entering your tank.
UV Sterilization: For an added layer of protection, consider UV sterilisation systems, which can be particularly effective in preventing algae growth.
Water Testing: Regularly test your water quality to ensure it meets safety standards for drinking water.

Aeration is a simple yet effective method for maintaining the quality and safety of stored rainwater. Introducing oxygen into your water tank can prevent stagnation, reduce harmful bacterial growth, and ensure a consistent supply of clean, fresh-tasting water.

As we increasingly face water scarcity and quality challenges, implementing proper storage and treatment methods like aeration becomes increasingly essential. With the right system and maintenance practices, you can enjoy the benefits of harvested rainwater while ensuring it remains safe for consumption.