FAQs

Questions, questions, questions. You have them. We have answers! From swimming pool resurfacing and fiberglass pool surface care to pool finish maintenance and commercial pool renovation, depend on Fibre Tech for your repair, resurfacing and refinishing needs! Here are a few questions we've answered through the years, many of them from homeowners, city pool managers, hotels and resorts, and even hot tub owners.


wading pool depth



  • Black, green or yellow patches on the surface?
  • How do I stop black algae?
  • Is it "Fibre Tech" or "Fiber Tech"?
  • What about yellow algae or pollen?
  • When do I perform maintenance?
  • Why is my family having skin irritation?
  • Why is my pool cloudy?
  • Why is my water clear but has a green tinge?
  • Why is my water green, yet I smell chlorine?
  • Why is my water rust colored (reddish brown)?
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    Q: Black, green or yellow patches on the surface?
    A: Most non-metal based algaecides will correct this problem. Simply follow the directions on the bottle.
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    Q: How do I stop black algae?
    A: Black algae are one of the hardest algae to fight. Take the following steps:
    • Brush the area with a nylon brush.
    • Shock with calcium hypo-chloride.
    • Circulate one-half hour, then shut down the filter for 24 hours.
    • Re-brush, then turn the system on for eight hours. Clean the filter after 24 hours.
    • Check the pH and alkalinity.

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    Q: Is it "Fibre Tech" or "Fiber Tech"?
    A: Our brand name is "Fibre Tech Inc.," not "Fiber Tech Inc." Also, "Fiber" and "Tech" are 2 separate words, it is not one word like: "FibreTech." Also, our company name is "Fibre Tech" not "Fibre Tec."

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    Q: What about yellow algae or pollen?
    A: There are two types of yellow-looking algae that are common. One is not really algae but rather pollen that fills the air in the springtime. The other is a type of algae that sticks to the walls of your pool.

    Yellow Pollen – Do NOT shock your pool to treat this – it will not work! Pollen will float on the pool surface and then fall to the bottom of the pool.

    Yellow Algae – This grows on the walls and when you use a nylon brush it will dust up into a cloud. This is a way of distinguishing between pollen and algae. To treat yellow algae:
    • Brush your pool surface with a nylon brush.
    • Add one pound of granular shock per 10,000 gallons. At the same time, add several capfuls of yellow treat. (There are several brands on the market such as Yellow Out, Yellow Treat, etc.)
    • Circulate for one half hour, then shut the pool filter off for 23 hours.
    • Brush again before turning the filter back on.
    • After the filter has run for 24 hours, CLEAN YOUR FILTER. If you don’t clean your filter, the algae will re-infect your pool water and you will have to start all over again!
    • Use a good non-metal based algaecide and this will help to prevent yellow algae.
    • After using any kind of yellow out, yellow treat, etc., be sure to do a new test reading of your chemicals and adjust as needed.

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    Q: When do I perform maintenance?
    A: It depends on the type of filter as follows.

    DE Filter – When the pressure gauge reaches 25 psi, you need to give immediate attention to your filter by back washing it. If you take the filter apart and the diatomaceous earth inside is hard as concrete, spray the filter with a garden hose to remove the earth. Next, take the grids and place in a tall plastic garbage can filled with a solution of one part muriatic acid to 10 parts water. Allow the grids to soak overnight. Rinse the grids with clean water, then reassemble the filter. If you see any holes in the fabric you will need to replace that particular grid.

    Cartridge Filter – The typical lifespan of a paper cartridge is approximately 1.5 years. You should replace the cartridge immediately if it is older than that in order to obtain maximum performance. Ideally, you should have two cartridges on hand – one to use as an immediate replacement and one to keep as a spare. If you want to do a deep cleaning of your cartridge filter follow these steps:
    • Take a tall plastic garbage can and add enough water to cover the cartridge. Add some Dawn dish soap (this is a degreasing agent). Put the cartridge into the solution and plunge it up and down several times. Let soak for two hours.
    • Rinse the cartridge with clean water.
    • Empty the soap mixture from the container and rinse it out. Add a solution of 10 parts water to one part muriatic acid to the container. Submerge the cartridge in the solution and soak for 24 hours.
    • Remove the cartridge from the solution and use a high pressure garden hose to rinse between all of the pleats.

    Tip: You may use two large plastic garbage cans with lids to store the two cleaning mixtures for repeated use.

    Sand Filters – The typical lifespan of the sand in this type of filter is five to seven years, according to manufacturers. After a long period of time the sand in the filter will become hard as concrete and cause an effect known as “channeling.” This is caused by water going through holes that have been formed through the hardened sand over time – rather than the water actually going through the sand. You may try the following steps to correct this problem:
    • You can try using a filter aid or sand filter cleaner. (There are many different brands of these available.)
    • Call your local pool service and have them change the sand.
    • If you want to try this yourself, use a wet & dry vacuum and be very careful not to break the laterals inside of the tank.

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    Q: Why is my family having skin irritation?
    A: There are several possibilities including:
    • High Chlorine
    • Too low/high pH
    • Alkalinity is too low/high
    • Low Calcium

    If your pH is too high, add liquid muriatic acid or granular sodium bisulfate. To increase your pH, add soda ash. If your pH is low, test the alkalinity before the water’s pH. If the alkalinity is low, adjust this first – and then retest pH the next day. Too low calcium also effects the pH and alkalinity. Adjust the calcium FIRST as required in the Use and Care Guide – then adjust the pH and alkalinity to proper levels. (This may take from 24 to 72 hours.)

    Please note:The ideal pH levels range from 7.2 ppm to 7.6 ppm.


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    Q: Why is my pool cloudy?
    A: If your pool is cloudy and you don’t know why, you first need to check the following chemical levels:
    • Stabilizer levels (cyanuric acid levels)
    • pH levels
    • Calcium Hardness levels
    • Free Chlorine levels

    If any of these levels are incorrect, this will cause cloudiness. Adjust the chemical(s) to the proper level per our Use & Care Guide to correct the problem.

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    Q: Why is my water clear but has a green tinge?
    A: Check the chlorine reading, then shock the pool as needed. However, you should check the alkalinity first.
    • Low alkalinity will cause metal fallout. Adjust the alkalinity as needed.
    • Be sure to add a sequestering agent to your pool.

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    Q: Why is my water green, yet I smell chlorine?
    A: The chlorine could be locked out due to over-chlorinating. You need to take a water sample to be tested for high levels. You may unlock the chlorine by taking the following steps:
    • Drain the pool way down and refill with fresh water to unlock the chlorine.
    • Test the pH and adjust as needed according to the Use and Care Guide.

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    Q: Why is my water rust colored (reddish brown)?
    A: This is a sign of iron in the water. Take the following steps to correct:
    • Use a sequestering agent in the water and run the filter for 24 hours.
    • Don’t shock the pool until the rust color is gone.
    • If the pool is stained, use metal out and have patience – it will work after time.
    • Check the pH and alkalinity as needed.

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