If you own a swimming pool in the Greater Phoenix area. you are probably going to be familiar with the term Total Dissolved Solids (TDS). TDS is best described by, “the total amount of mobile charged ions, including minerals, salts or metals dissolved in a given volume of water, expressed in units of mg per unit volume of water (mg/L), also referred to as parts per million (ppm).” In the pool industry TDS is directly related to the purity of water and usually a number that is referred to when it’s time to change out the existing water in your swimming pool. Between TDS and calcium hardness, they are the two most common factors as to why a water change would be recommended.

Dissolved solids come from organic sources such as leaves and silt, it can also come from fertilizers and pesticides too. Dissolved solids also come from inorganic materials such as rocks and air that may contain calcium bicarbonate. But, the most common place that these dissolved solids come from is our water. In Arizona, we get our water from the Colorado River by way of the Grand Canyon which is loaded with limestone. The water then picks up many of these metals because of where it is sourced which over time causes numerous problems to the surface of the pool, the interior finish, spillways and pool equipment.

As this water evaporates, the minerals remain in solution and gradually build up in concentration. This in turn slowly destroys the surface of the swimming pool but can also make it harder to handle the water chemistry as well. The general rule of thumb is to change out the water in your swimming pool every two years. If you take a water sample into a pool store they will usually recommend changing out your water when TDS levels climb above 3,000ppm (unless you have a salt water pool).

Recently, we recycled a swimming pool (pictured above) using our Reverse Osmosis (RO) Mobile Filtration trailer because our customer’s TDS levels were extremely high. The following are results that were obtained…..

Initial Chemistry:

Calcium Hardness – 1000 parts per million (ppm)

Total Dissolved Solids – 5300ppm

Cyanuric Acid – 100ppm

After filtering this 20,000-gallon swimming pool for 15 hours we were able to conserve 16,000 gallons using our mobile filtration trailer. By using our service they were able to achieve the following ending chemistry which is much better than our tap water…..

Calcium Hardness – 150ppm

Total Dissolved Solids – 660ppm

Cyanuric Acid – 15ppm

Our mobile filtration trailer processes both residential and commercial swimming pools. We service Scottsdale, Cave Creek, Phoenix, Mesa, Tempe, Gilbert, Chandler, Glendale, Peoria, Avondale, Litchfield and more. Please contact us today If you are having issues with the following:

  • High calcium hardness
  • High TDS
  • High CYA
  • High phosphates
  • High salt levels
  • Waterborne diseases

On a side note, at Monarch Pool Services we highly recommend always having your calcium hardness tested to determine if your water needs to be changed or not. If you have any questions on the above, please let us know!