How is the salt added and how often?
Salt is added directly to the pool water. Before putting the equipment into operation, the pump must be run until the salt is completely dissolved. The salt is not consumed in the process. It is only necessary to replace the salt loss caused by filter washing, topping up the water level, etc.
What kind of salt should be used? And how much?
Any type of common salt is perfectly acceptable. If very unrefined salt is used, temporary dirt or impurities may appear in your pool water, but this will not generally affect its chlorination. The recommended amount of salt is 5 to 6 kg per m3 of water in the case of unheated pools and 3 to 4 kg per m3 of water in the case of heated pools (28 - 30oC).
What is the recommended chlorine concentration in the water? And the recommended pH?
The recommended concentration of residual chlorine for private pools is around 1 ppm. In public swimming pools, this concentration is included in the regulations in each region and is usually around 1.5 ppm. For the chlorine to be effective, the pH must always be between 7.0 and 7.6.
Can a disinfected pool lose its chlorine after the water has been filtered?
If the filter is dirty, the amount of available chlorine in the water will decrease after it passes through the filter because the chlorine will react with organic matter trapped in the filter.
Is salt water chlorination compatible with the use of chemicals such as flocculants or algicides?
Salt water chlorination is compatible with all types of chemical products, although, in principle, if you use your salt water chlorination system properly, you will not need to add any additional products.
Why doesn't the chlorine level rise in the pool if the salt level is correct and the pH is well regulated?
This usually happens in new pools or in pools that have recently had their water changed. Solar radiation and heat quickly break down the free chlorine in the water in a pool, so in pools with high sun exposure, the chlorine stays in the water for a short time, even though its production rate is high. Also, keep in mind that the chlorine produced by your chlorinator is pure and free of additives, which makes it especially reactive and, although this is one of its main advantages, it can lead to low concentration readings under these conditions. If you have difficulty maintaining residual chlorine levels in your pool, you can use a chlorine stabiliser.