INNOVATIVE TECHNOLOGY
FOR COMMERCIAL POOLS & SPAS
The Benefits of On-Site Sodium Hypochlorite Generation in Aquatic Applications
Stringent regulation of toxic gases and accidental releases of chlorine have required industry professionals to seek alternative methods of disinfection.
Chlorine has become more regulated and the cost has increased to the point where many facilities have evaluated the alternatives and found on-site generation of sodium hypochlorite to be their best available technology for disinfection and healthy swimming.
How long has on-site generation of sodium hypochlorite been available as an alternative to purchased chlorine?
On-site generation of sodium hypochlorite has been a key process in water treatment for municipal and industrial applications for more than 30 years. Simply Water distributes an array of systems that have been designed, manufactured, installed and operated since 1988.
What are the benefits of on-site generation?
On-site hypochlorite is a dilute form of disinfectant compared to chlorine gas or concentrated commercial hypochlorite. As a result, handling, transportation and containment are easier and safer. The benefits of the process over chlorine gas, calcium hypochlorite and bulk sodium hypochlorite include:
• 50-75% annual savings of chlorine and pool chemicals
• Improved inactivation of microorganisms
• Increased water quality by reduced disinfection byproducts
• Removal of Biofilm
• Improved health conditions and improved air quality
• No skin or eye irritations
• No respiratory related conditions from gaseous chloramine exposure
• Reducing risk to pool personnel from handling and storage of hazardous materials.
• Eliminating the bulk storage of chemicals
• Eliminating transportation liabilities
• Reducing the threat to public safety
How do the costs of on-site generation compare to purchasing chlorine?
The only costs for on-site generation are electricity, salt and water. Savings vary depending on energy costs, but the typical user of an on-site hypochlorite generator system realizes savings of 50 - 75% in operating costs compared to commercially purchased chlorine in most areas.
How does on-site generation work?
 The process begins with using water from a standard hose bib connection on a fresh water line in the mechanical room. The water then flows to a small 10 inch cartridge filter to remove dirt from the city water supply.
The water then flows to a set of water softeners that remove the calcium from the supply water (this is important as we do not want calcium in our brine water for an electrolytic process). The softened water then flows to the brine tank. The salt the system requires is contained in the brine tank…not in the pool.
Once the water mixes with the salt in the tank the softened brine water then flows to another 10 inch cartridge filter to remove any dirt that may be in the brine tank. The brine water then flows to the cell which is located in a cabinet mounted on a wall or skid (not in-line with the pool circulation and filtration system).
The cell is where the chlorine reactions are made and then the chlorine solution flows to a holding tank (oxidant tank) and stored. Once the tank is full the generator will stop producing chlorine and go into a standby mode automatically.
The oxidant tank has an ultrasonic level sensor that detects the volume level in the tank. As the tank volume decreases the generator will start up automatically and begin producing more chlorine to refill the oxidant tank. The chlorine is simply fed from the oxidant tank to the pool return line via chemical metering pumps or venturi systems as needed from swimmer demand.
The oxidant tank is sized for the entire demand of daily consumption therefore peak swimming times and moderate swim times can be accommodated without any adjustments to the chlorine generator.
How safe is the system?
The system is designed from the ground up to provide safe generation of sodium hypochlorite. HAZMAT standards begin at 1%, therefore by generating a 0.8% hypochlorite solution, there is a greatly reduced risk to the operator through accidental exposure and the handling and storage of hazardous chlorine material. The system also is designed with a four-tier safety interlock, preventing the system from operating unless all system components are positively shown to be operating properly.
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