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High Calcium Hardness and Swimming Pools

As a swimming pool owner in the San Diego area and many parts of the country dealing with high levels of Calcium Hardness and Total Dissolved Solids (TDS) is extremely common. We deal with it because of our tap water in San Diego is loaded with calcium, magnesium and other hardness minerals. Since we constantly fill up our swimming pools with this hard water it will cause problems to your investment. If you own a residential or commercial swimming pool have you ever noticed the white ring around the pool or around your water features? Simply put, this is calcium and it will cause damage to your swimming pool.

Since we fill up our swimming pools with hard water, eventually it will increase in concentration. It rises in concentration because as pool water evaporates the hardness minerals remain in the water and gradually builds up in concentration. As the days, months and years go by eventually the water will get to a point where calcium scaling will occur on the water tile line, the interior finish, filtration equipment, saltwater chlorinators (if you have one), spillways and decorative water features. When this happens it can be tough to look at and even more challenging to remove. In the swimming pool industry, the normal levels of Calcium Hardness (CH) in water is between 200 – 400 parts per million (ppm) and TDS is recommended to be below 3000 ppm. When these levels get higher than that, most pool professionals will recommend a drain and refill. At Pure Water Industries, we recommend recycling the swimming pool water using our Reverse Osmosis (RO) filtration system (Puripool) because we can not only give you better water than tap but we can also conserve up to 85% of the existing water in the pool as well. This past week, we filtered a 20,000-gallon swimming pool because their calcium and TDS was high and we want to share those results with you.

Initial Chemistry

Calcium Hardness – 860 ppm

Total Dissolved Solids – 4162 ppm

Cyanuric Acid – 200 ppm

After filtering this swimming pool for 14 hours we were able to leave them with the following ending chemistry which is much better than tap….

Calcium Hardness – 100 ppm

Total Dissolved Solids – 428 ppm

Cyanuric Acid – 0 ppm

By using RO filtration we were able to give our customer much better water than tap and we were able to complete this job in less than a day compared to 2 -3 days for a drain and refill. We are superior to a drain and refill because our water in San Diego isn’t as good as the drinking quality water that we can achieve. So, if you want to swim in the best quality of water, contact us today to schedule an appointment!