Planning to use harvested rainwater for bathing, handwashing, cooking, or drinking? You’ll need a treatment system designed for that use. UV disinfection is one option: ultraviolet light treats microorganisms as water passes through the unit. It works best as part of a properly designed system, with effective pre-filtration, the right flow rate, and regular maintenance. Here’s how UV systems work and what to consider before choosing one.
What is a UV sterilization system?
A UV system uses a lamp inside a protective quartz sleeve to expose flowing water to ultraviolet light. When the system is correctly selected and operated, UV light can inactivate microorganisms in the water. The treated water still needs to be protected from contamination after it leaves the unit.
Rainwater collected from a roof can carry particles and debris. UV treatment does not remove sediment, chemicals, or other contaminants, and particles can interfere with treatment. That’s why a rainwater system typically needs appropriate filtration before the UV unit, along with a flow rate and equipment suited to the water and how you plan to use it.
Choosing a UV system for rainwater
UV systems vary in capacity, features, and cost. Some products are identified as Class A or Class B. Class B units are generally intended for supplemental treatment, rather than as a stand-alone disinfection system for drinking water. Check the product’s intended use and installation requirements, and confirm what your local health or building authorities require for indoor rainwater use.
Choosing the right system depends on your water source, pre-filtration, peak flow rate, intended uses, and applicable local requirements. Proper installation and ongoing maintenance, including replacing the lamp and cleaning the sleeve as directed by the manufacturer, are important for reliable operation.
Examples of UV systems
These Class A systems in our catalog offer different rated flow capacities. The right fit depends on your system design and peak water demand, so use the ratings as a starting point rather than a substitute for sizing guidance.
- Viqua Model PRO 10, 10 GPM
- UV Dynamics NSF 55 Class A Ultraviolet Sterilizer, 11 GPM
- Viqua Model PRO 20, 20 GPM
Plan a safe rainwater system
Rain Brothers has installed hundreds of rainwater harvesting systems, from garden and livestock applications to systems designed for indoor use. The right setup depends on your property and how you plan to use the water, so start with those details when evaluating treatment options.
Explore our UV water filters, or call or text Rain Brothers at 937-949-1100 to talk through your rainwater project and find a system suited to your needs.
