answersLogoWhite
Swimming Pools
Pool Care and Cleaning
Chemistry

If you add softened water to a swimming pool with hard water rather than draining and refilling how could the addition of soft water be corrosive?


Top Answer
User Avatar
Wiki User
2010-09-20 01:42:33
2010-09-20 01:42:33

The corrosive properties of water are not affected by its hardness. This is a common misconception that can be explained by the types of source water that yield naturally soft or naturally hard water. If your water is naturally soft, there is a good chance it is also corrosive due to other factors.

Surface water sources that supply naturally soft water often have low (acidic) pH, low TDS (total dissolved solids), and high dissolved gas concentrations such as oxygen and CO2 that can contribute to corrosion. Naturally hard water often comes from a well and has higher pH, higher TDS, and lower dissolved gas concentrations. These correlations are due to the water source and are not caused by the hardness of the water.

If your water has been softened using sodium cycle ion exchange in a water softener, the corrosive properties of your water are not affected. A water softener removes calcium and magnesium ions and replaces them with an equivalent amount of sodium ions. This process has no significant effect on the corrosive properties of the treated water.

Removing hardness by reverse osmosis (RO) or deionization (DI) can significantly increase the corrosive properties of water because they both drastically decrease the dissolved solids in the water, and the latter can alter the pH. This sort of filtration is beyond the scope of the question.

You still must maintain the correct pH and alkalinity levels in your pool, though your water softener will not affect these levels. Your local pool supply store can furnish you with the proper test kits and chemicals to accomplish this.

Related Questions

User Avatar

My suggestion would be to dilute the water by draining 1/2 of it & refilling it with the wonderful spring water that you have. :O

User Avatar

The softened the blow with some good news.You have softened up.They were softened in the wash.

User Avatar

Sometimes margaine is hard when it's been in the fridge. Softened margarine is just that - soft margarine!

User Avatar

Pulp is softened wood fibers used to make paper.

User Avatar

Softened water is perfectly pure, wholesome and safe to drink. Some people especially like it because it has a "silkier" texture than hard water. Overly-softened water (unfortunately, rather common) has an unpleasantly "slick" taste and feel. Softened water has a higher sodium content than most plain tap water, but not excessively so, unless it has been excessively softened (as mentioned above). Properly softened water does not jeopardize your sodium intake if you are monitoring that, and your own doctor will verify that.


Copyright © 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.