A key factor in achieving and maintaining clean and hygienic pool water is the filtration of solid particles from the water. If no solid particles are present in the pool water, a low, but constant level of chlorine will disinfect the water and prevent algae from starting to grow. One could say that grafting of algae does not occur because of the lack of nucleus. A sand filter is most common for filtration of water and the most reliable and convenient ones have a side-mount Multi-port valve.

Quality is our criterion for pool water sanitation

Manual addition of chlorides has been common practice for residential pools for decades. Although chlorine is an ongoing issue for concern of health, it is still one of the safest means for disinfection of (pool) water.

Very important for pool water is that the chlorine level is kept at a safe low level, but also a very constant level. Manual addition of chloride to the pool water usually takes place at a frequency of once or twice a week, but many times even less frequent. Then, depending on the usage of the pool chloramines may be formed (giving the well-known chlorine smell), and/or when solid particles are present in the water, algae growth may be initiated.

Subsequently large amounts of chlorine may be needed to kill the algae or to convert the chloramines back to chlorine. And even worse, one tends to use “Algae controlling” products containing (poisonous) copper compounds.

The most preferred and absolutely best way to “add” chlorine to pool water is by generating chlorine from salty pool water. Pure kitchen salt is added to the pool at about 0.3% by weight and dissociates in the water into Na+ and Cl- ions. Via electrolysis, the chlorine is released at a constant level and a steady rate and formed into hypochlorous acid (HOCl). The chlorine disinfects the water and the by-products convert back to salt again, thus forming a closed-loop system.  

More importantly for the pool user; the salt in the pool water adds comfort to the swimmer; eyes are less irritated because of similar salt levels (0.7 to 0.9% for tear drops). Also thanks to the lack of chloramines no bad smell to the water and absence of eye or skin irritations. The low and steady level of pure chlorine and thus the absence of harmful chloramines, does not damage swimwear.