Salt water chlorination systems for commercial swimming pools in Fayetteville provide pool owners with clean, comfortable water without the unending maintenance that traditional chlorine pools demand. Salt systems are simple to operate and a pleasure to own, but they do have an enemy: phosphates.
Phosphates are compounds of phosphorous ions and other elements, such as sodium, calcium, or potassium, and they are everywhere.
To help us better understand the battle between salt systems and phosphates, let’s first consider how salt systems work.
Salt systems, such as the IC40 Pentair salt system, create chlorine using electrolysis. Water containing salt (NaCl) in a concentration of at least 3000 ppm (parts per million) enters into the pool’s chlorine generator and passes through the salt cell.
The cell is where electrolysis takes place. During electrolysis, a low-voltage electrical current passes between two electrodes. One electrode, the anode, is positively charged and the other, the cathode, is negatively charged. When the salty water molecules pass between these two oppositely charged electrodes, the molecules are pulled apart, or split. The split creates hydrogen gas and hypochlorous acid. The hydrogen gas leaves the pool in bubbles and the hypochlorous acid, or free available chlorine, sanitizes the swimming pool water, reverts back to salt, and the process begins again.
Keeping in mind this basic understanding of how an IC40 Pentair salt system works, there are basically three things that can cause the system to fail:
Two of these three reasons for failure—insufficient salt and compromised electrodes—can be, at least in part, attributed to phosphates.
Why would a closed system that had plenty of salt to function properly one day have insufficient salt the next? Every pool has a bit of algae, which chlorine works to kill. Algae grows, chlorine kills it, and balance is maintained.
However, phosphates are algae food. If the phosphate level in the water grows above a normal level, the algae then has more food and can grow faster than normal, and then the existing chlorine is insufficient to kill the higher level of algae.
Suddenly, your pool is filled with algae and the chlorine level has dropped, not because your pool created less chlorine, but because more chlorine was used to kill the algae and less was left to sanitize the water. Thus, high phosphate levels “cause” insufficient salt.
Electrolysis is the key to a functioning salt system. The salt cell and electrodes need to be clean and free from corrosion or other interference in order to allow the electrical current to flow freely and do its job. Some phosphates are known to adhere to metal. A coating of phosphates on the electrodes can disrupt the electrical current and slow down the electrolysis.
Since phosphates are the enemy to a clean, well-functioning pool, how can you keep them out of your water? This is no easy task, as phosphates are everywhere.
Here a few tips from swimming pool contractors that can help you maintain critical balance in your pool:
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