The dosage of liquid sodium hypochlorite NaClO purchased …
… is widely used in small water treatment plants, which have a low consumption of free chlorine. The commercial sodium hypochlorite solution contains about 150 Grams per liter of free chlorine. This corresponds approximately to a concentration of 13%. The technical limit for the production is slightly higher.
The investment costs for the use of sodium hypochlorite from the market are comparatively low. The dosage of liquid sodium hypochlorite is done with simple metering pumps. The material must be resistant to the liquid. The proportional pumps can also be powered by water pressure.
The decay of the product already begins on the transport route. The minimum concentration at the sale is with DIN EN 901 fixed. But also by long storage, high temperatures and sunlight, the concentration of the free chlorine is further reduced. It is expected a daily loss of 1 grams per liter.
For stabilization, the sodium hypochlorite is brought to a high pH-value. So when dosing it increases the pH of the water. This can lead to precipitation of lime. In particular, the metering valves may be hit hard by. Also deposits of limestone on the walls of the pool are not uncommon.
The risk associated with the use of liquid sodium hypochlorite is mainly in the human actions. Mixing with hydrochloric acid HCl poses a particular risk. It would create chlorine gas in a very exothermic reaction. Therefore, color coding and security vessels are required.
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