Calcium from hard water in your swimming pool

This is a term that is used all over the swimming pool industry and widely used when you take your pool water sample into a pool store. If you aren’t sure what describes pool water as being “old” that would be a great place to start this blog post. Swimming pool water pretty much has a mind of its own and the longer you leave it in your swimming pool the more challenging it is to take care of it. Typically, if your pool water hasn’t been changed out in two years, then it would be characterized as being old but at Pool Water Recycling we don’t really believe in that term. Water is a natural solvent, and that means that the longer that the same pool water has been in place, the more solids that are dissolved in it.  Drought prone Southern California is hardly a place that can afford to have pool owners dumping tens of thousands of gallons of water down the sewer drain so we’ve come up with a solution to help every swimming pool owner. Simply put our tap water is loaded with calcium hardness, magnesium, and other hardness minerals. As pool water evaporates, these hardness minerals remain in solution and gradually rise in concentration. As the water gets harder and harder, calcium will scale the water tile line, the interior finish of the swimming pool, filtration equipment, spillways and water features.

Another term that is commonly used in the swimming pool industry to describe hardness in your water is Total Dissolved Solids (TDS) which is a measure of everything that has ever dissolved in your swimming pool water. This includes minerals that come from your pool chemicals, such as calcium and sodium, and every other bit of dissolved dust, pollen, swimmer waste, algae remains – everything! Please keep in mind that some people will use calcium hardness and TDS to describe hardness in your water and meaning the same thing but they are not. Calcium hardness is simply just the calcium and other hardness minerals in your swimming pool whereas, with TDS that can be a measure of what was described above along with salts etc.


If you live in an area like Southern California, your swimming pool water will rise in calcium, TDS, and cyanuric acid (CYA) levels every day. If you want to prevent heavy scaling then you should use our mobile filtration trailer which houses a Reverse Osmosis (RO) unit to lower all the hardness minerals in your swimming pool without draining it. We can conserve up to 85% of the existing water in your pool, there’s no downtime because you can swim in the pool while the process is being performed, we promise you better water than tap and if you want to prolong the lifespan of your investment we suggest using our service every two years. Curious to know more and swim in drinking quality water? Contact us today at 714-319-4812 to schedule your appointment today.

We proudly service Orange, Los Angeles, and Riverside County!