Your pool’s pH is at the heart of your water balance and is key to the interaction between the other components of your water chemistry. The water’s pH can make your pool’s chlorine significantly less effective. It can cause itching or irritation for your swimmers, and can influence either etching of pool surfaces or deposits of calcium, scaling, or crystals on the pool surfaces and salt cells if it’s not kept on track.
Ideally, your pool’s pH should be kept between 7.4-7.6. Your pool’s pH can change quite rapidly, though, and with only weekly measurement and adjustment you spend a significant percentage of the time above or below the target pH. Weekly pH management is simply too infrequent.
We carry CO2 tanks, and you can also buy or rent a tank locally. To fill your tank, you have a lot of options ranging from hardware stores, sporting good stores, welding supply stores, restaurant supply stores (CO2 is used in soda fountains and beer tap systems), home brew supply stores, paintball supply stores, and more.
The CO2 gets absorbed into your pool water, forming "carbonic acid" to keep the pH balance in check. So you're not seeing CO2 bubbles coming out of your pool jets and immediately escaping the pool; rather, its getting dissolved into the water where it forms CH2O3.
This system actually has patented technology that allows for predictable CO2 usage. When sized right, refills are extremely infrequent - as little as once a swim season or even less. The manufacturer site gives pretty detailed information about CO2 use, you can see that here.
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