Pool Care

Water Balancing

Water balancing is not such a complicated exercise. It is simply the relationship between different chemical parameters. Your water is constantly changing, year round. Everything from weather to oils, to dirt, and cosmetics affect you water balance. You will probably not change the water in your pool for many years. Continuous filtration and disinfection removes contaminants which keep the water enjoyable but this is does not balance your water.  A pool that is "balanced" has proper levels of pH, Total Alkalinity, and Calcium Hardness.  It may also be defined as water that is neither corrosive or scaling.  This concept is derived from the fact that water will dissolve and hold minerals until it becomes saturated and cannot hold any more water in solution.

When water is considerably less than saturated it is said to be in a corrosive or aggressive condition.  When water is over saturated and can no longer hold the minerals in solution it is in a scaling condition.  So then, balanced water is that which is neither over or under-saturated.  The cliché that "water seeks its own level" certainly applies here. Water which is under-saturated will attempt to saturate itself by dissolving everything in contact with it in order to build up its content.  Water which is over-saturated will attempt to throw off some of its content by precipitating minerals out of solution in the form of scale.  How do we know when our water is over or under saturated?  We use a good test kit (with  fresh testing reagents) to measure the chemical parameters of pH, alkalinity, and calcium hardness.
 
pH

pH is a measure of how acidic or basic the water is.  pH is a logarithmic scale from 0-14, with 7 being neutral.  Below 7 and a substance is defined as being acidic, while levels above 7 are said to be basic or alkaline.  Everything that enters your pool has a pH value.  Ever heard of acid rain?  This is rainfall with a very low pH.  The human eye at a pH value of 7.35, is just slightly basic.  This is, coincidentally, in range with proper pH levels for your pool.  To have pH in balance we adjust the water with additions of pH increasers (bases) or pH de-creasers (acids) to achieve the range of 7.2 - 7.8.  If your testing (recommended daily) of the water shows a pH value below 7.2 the water is in a corrosive (acidic) condition and you will need to add a base to bring the pH into a more basic range to prevent corrosion.  Conversely, if the pH is above 7.8, we are in a scaling (basic) condition and must add an acid to bring down the pH to prevent the formation of scale.
 
Total Alkalinity

A close cousin of pH, the level of alkalinity in the water is a measurement of all carbonates, bicarbonates, hydroxides, and other alkaline substances found in the pool water.  pH is alkaline dependenshare this page