Swimming pool water balancing is not such a complicated exercise.

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It is simply the relationship between different Chemical parameters. Your fiberglass pool water is constantly changing, year round. Everything from weather to oils, to dirt, and cosmetics affect you swimming pool water balance. You will probably not change the water in your inground fiberglass pool for many years. Continuous filtration and disinfection removes contaminants which keep the swimming pool water enjoyable but this is does not balance your water. A fiberglass swimming 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 nor scaling. This concept is derived from the fact that water will dissolve and hold minerals until it becomes saturated and cannot hold any more minerals in solution. When fiberglass swimming pool water is considerably less than saturated it is said to be in a corrosive or aggressive condition. When pool water is over saturated and can no longer hold the minerals in solution it is in a scaling condition. So then, balanced fiberglass swimming pool water is that which is neither over nor 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. Fiberglass swimming pool 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 fiberglass swimming pool water is over or under saturated?  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 fiberglass swimming pool 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 swimming 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 fiberglass swimming pool. To have pH in balance we adjust the pool water with additions of pH increasers (bases) or pH de-creasers (acids) to achieve the range of 7.2 - 7.6.  If your testing of the pool water shows a pH value below 7.0 the water is in a corrosive (acidic) condition and you will need to add a base (baking soda) to bring the pH into a more basic range to prevent corrosion. Conversely, if the pH is above 7.6, we are in a scaling (basic) condition and must add an acid to bring down the pH to prevent the formation of scale and prevent the pool water from becoming so alkaline as to render every sanitation treatment ineffective.

 Total Alkalinity

A close cousin of pH, the level of alkalinity in the pool water is a measurement of all carbonates, bicarbonates, hydroxides, and other alkaline substances found in the fiberglass pool water.  pH is alkaline dependent; that is, alkalinity is defined as the ability of the pool water to resist changes in pH.  Also known as the buffering capacity of the pool water, alkalinity keeps the pH from "bouncing" all over the place.  Low alkalinity is raised by the addition of a base (similar to pH); sodium bicarbonate (baking soda) is commonly used.  High levels of alkalinity are lowered by the addition of an acid (similar to pH). Experts recommend "pooling" the acid in a small area of low current for a greater effect on alkalinity. That is, adding an acid will lower both pH and alkalinity. Walking the acid around the swimming pool in a highly distributed manner is said to have a greater effect lowering the pH than the alkalinity. Pooling the acid has the opposite effect. A very important component of water balance, alkalinity should be maintained in the 80-120ppm range for "Gunite" and concrete pools and 125-170ppm for painted, vinyl, and in ground fiberglass swimming pools. Levels should be tested bi-weekly.

 Calcium Hardness

When we speak of scale, we are talking about calcium carbonate which has come out of solution and deposited itself on pool surfaces.  It is a combination of carbonate ions, a part of total alkalinity and calcium, and a part of the Calcium Hardness level.  The test for Calcium Hardness is a measure of how "hard" or "soft" the water is testing. "Hard" fiberglass pool water can have high levels of calcium and magnesium.  If these levels are too high the water becomes saturated and will throw off excess particles out of solution which then seeks to deposit themselves on almost any surface inside the fiberglass swimming pool.  This is calcium carbonate scale; a "white-ish," crystallized rough spot.  If the levels are too low, the pool water is under-saturated.  If under saturated, the pool water will become aggressive as it attempts to obtain the calcium it needs.  Such "soft water" will actually corrode surfaces inside the fiberglass swimming pool which contain calcium and other minerals to maintain its hardness demand.  If your Calcium Hardness levels are too high you can lower the levels by dilution (adding water to the pool which has a lower calcium hardness content).  Swimming pool water levels which are too low require the addition of calcium chloride.  Recommended range for calcium hardness is 200-400ppm.  Calcium Hardness levels should be tested every 4-5 months.