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    Main » FAQ [ New question ]

    cidic and basic are two extremes that describe chemicals, just like hot and cold are two extremes that describe temperature. Mixing acids and bases can cancel out their extreme effects; much like mixing hot and cold water can even out the water temperature. A substance that is neither acidic nor basic is neutral.

    The pH scale measures how acidic or basic a substance is. It ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic. Each whole pH value below 7 is ten times more acidic than the next higher value. For example, a pH of 4 is ten times more acidic than a pH of 5 and 100 times (10 times 10) more acidic than a pH of 6. The same holds true for pH values above 7, each of which is ten times more alkaline—another way to say basic—than the next lower whole value. For example, a pH of 10 is ten times more alkaline than a pH of 9.

    Pure water is neutral, with a pH of 7.0. When chemicals are mixed with water, the mixture can become either acidic or basic. Vinegar and lemon juice are acidic substances, while laundry detergents and ammonia are basic.

    Chemicals that are very basic or very acidic are called "reactive.” These chemicals can cause severe burns. Automobile battery acid is an acidic chemical that is reactive. Automobile batteries contain a stronger form of some of the same acid that is in acid rain. Household drain cleaners often contain lye, a very alkaline chemical that is reactive.

    Added by: Clayton (pet)

    The pH is one of the most important factors in pool water balance and it should be tested and corrected at least every week. pH is the measure of how acid/ alkaline the swimming pool water is. A pH of 7.0 is neutral - below 7.0 is acidic, above 7.0 is alkaline. The pH of our eyes is 7.2 . No wonder that the ideal pH for your pool is just that - 7.2 , and should be kept within the range of 7.0-7.6 .
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    No, when one drains the pool and there happens to be water under the shell (like in the rainy spring when people want to clean up the pool) the entire pool shell can heave.
    This is because the water under the pool creates an upward hydrostatic force (through buoyancy) and the pool is lifted out of the ground .

    Added by: Alex Luberman

    To Prevent Cloudy Pool Water:

    1. Maintain proper water balance. Chlorine and pH levels should be maintained at 1.0 - 3.0ppm and 7.2-7.4.
    2. Proper levels of Calcium Hardness and Total Alkalinity help to prevent solids from precipitating out of solution
    3. Pool pumps should run long enough daily to filter all of the water at least once, or twice during warmer months.
    4. Shower before swimming. Cosmetics, Hair and Skin Lotions, Deodorants, etc all contribute to cloudy pool water.
    5. Superchlorinate the pool at the first sight of hazy water conditions. Before it turns cloudy and then murky.
    6. Keep a level of Cyanuric Acid in the pool water, at a minimum of 40ppm, to help reduce the summer sun's effect on Chlorine levels.

    Total Alkalinity is a measure of the amount of buffering capacity in the water. It acts as a shock absorber for the pH. If Total Alkalinity is too low, the water is acidic and can corrode equipment and hot tub surfaces. It also causes pH bounce. The pH will drift down and any adjustments made to it will bounce and be difficult to control. If Total Alkalinity is too high, the water is alkaline and scale buildup and cloudy water can result. The pH will tend to drift up and will be very difficult to adjust.


    Total Alkalinity, like pH, is affected by environmental factors. Rain, acidic sanitizers, addition of fill water and other product applications can all change the alkalinity over time. Total Alkalinity should be tested once every three to four weeks.


    Proper Total Alkalinity levels vary with the water temperature and the sanitizer used. Ideal range for Total Alkalinity is from 125 - 150 ppm. For chlorine or bromine spas, levels of Total Alkalinity up to 200 ppm are acceptable, and the high cutoff is 170 for Biguanide spas. The cutoff is slightly lower for Biguanide spas due to the foaming tendency of the product and the tendency for pH to drift upward.

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