When calcium levels get high in your swimming pool you are going to need to do something with the water. If you live in the Central Phoenix area, calcium hardness is something you’re going to have to deal with and we want this blog post to help you with where it comes from, what appropriate levels are and how to lower them without draining the swimming pool. When it comes to calcium hardness, the recommended levels for your swimming pool is between 200 – 400 parts per million (ppm). In Arizona, this is extremely hard to obtain because the calcium levels coming out of the tap are usually 400ppm! So, many of you are probably asking how is it possible for your water to ever be between the recommended levels? Well, you are in luck now and we plan on sharing that with you in this blog post.

Reverse Osmosis Mobile Filtration is now available in Scottsdale, Phoenix, Cave Creek, Tempe, Chandler, Gilbert, Glendale, Litchfield, Peoria, Avondale and many more areas because Monarch Pool Service has added The Puripool Process to their list of services to valley swimming pool owners. Our process is mobile which means we come to your residential or commercial property and recycle the water on site. Since we use RO filtration we can lower calcium hardness, total dissolved solids (TDS), cyanuric acid (CYA), phosphates, salts, waterborne diseases and so much more. As stated above, residents in the Greater Phoenix area are going to deal with high calcium hardness levels in their swimming pool. Recently, we were hired by a homeowner in the Scottsdale area that had 1650ppm calcium hardness. That’s four times higher than the recommended amount. When this happens, calcium scaling will occur on the water tile line, the interior finish, filtration equipment, spillways and decorative water features. If enough scaling has occurred it can be quite expensive to remove. When we arrived at their house with our mobile filtration trailer we measured the following initial chemistry:

  • Calcium hardness – 1650ppm
  • Total Dissolved Solids – 5713ppm
  • CYA – 200+ppm


Our mobile filtration trailer

After filtering this swimming pool we were able to conserve around 85% of the existing water in the pool and leave our customers with the following ending chemistry:

  • Calcium hardness – 160ppm
  • Total Dissolved Solids – 415ppm
  • CYA – 30ppm

As you can see, using RO we were able to take their calcium hardness levels down to 160ppm which is much better than tap water and within an acceptable range for your swimming pool. With mobile filtration, you can achieve drinking quality water in your swimming pool so the next time someone tells you that your calcium hardness levels are high, remember to recycle instead of draining your swimming pool. If you should have any questions, contact us today!