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To perform properly, UV disinfection requires rainwater to be free of any sediment over 5 micron in size. If the rainwater has not been filtered, ‘shadowing’ can occur, whereby sediment blocks the UV light rays, reducing the effectiveness of the disinfection.

Adding chlorine (sodium hypochlorite) to water is an effective and relatively simple way to disinfect filtered rainwater.

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Although rainwater appears to be clean to the naked eye, we need to consider its journey to point of use.  This pathogen-rich rainwater can cause sickness or infections if it comes into contact with open wounds or is ingested.  It is not safe to use until treated as it poses a risk to those exposed to it, particularly those in continual contact.

There are two main steps to rainwater treatment – filtration for removal of sediment particles, then disinfection using chlorine or UV light.

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UV disinfection uses certain wavelengths of ultra violet light to destroy micro-organisms (bacteria, virus, and cysts such as cryptosporidium and giardia), in the water.

Rainwater harvested from a roof travels down a pipe into a storage tank or pit. Dense sediment will settle at the bottom of the tank. A float switch triggers the operation of the system to commence pumping or a pressure drop inline indicates the need to treat and transfer water instantaneously.

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UV Disinfection is the most commonly used method for rainwater treatment, as it is simple, cost effective and requires minimal operator input.  Certain wavelengths of UV light destroy the micro-organisms in water that pass it.

Filtration consists of at least two stages.  Removal of coarse solids to 100 micron, then fine solids of 1-5 micron; via a cartridge, bag or screen filter prior to disinfection.

The first step involves removing sediment.  This is essential prior to the disinfection process, for maximum efficiency of the disinfection stage.

Collected rainwater isn’t necessarily immediately safe to use. A process of treatment and sterilisation is essential to make rainwater compliant with regulations and safe to use for your business.

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Chlorine Disinfection ensures a disinfection residual for a period of time.  However introducing a chemical to a water supply requires consistent and regular operator input to ensure correct operation.

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Contact us today to discuss your rainwater treatment requirements, and discover how we can help you achieve clean, safe water for your business. Freecall 1800 656 771 or email James.

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Southland Filtration is a leading Australian provider of commercial water filtration solutions. We’ve been helping businesses since 1995 with a focus on quality, custom solutions, and reliable service. We work with businesses and organisations in Australia and New Zealand to address their unique water challenges and maintain the highest standards.

Ensuring your rainwater is safe and compliant for business use is crucial. Southland offers expert solutions for rainwater treatment and sterilization, tailored to your specific needs.