Fiber Clear is not a replacement for sand in a sand filter. However, it can be used in a sand filter as a filter aid. Add one Fiber Clear cup at a time to the sand bed, until the pressure has risen to one pound. What you are trying to do is coat the top of the sand bed with approximately a 1/8 ” layer of Fiber Clear. Make sure to watch the pressure gauge as Fiber Clear filters to 2 microns and sand normally filters at the 30 to 40 micron level. Therefore, the pressures will increase rapidly. Fiber Clear may “load-up” quickly and will need to be backwashed within 24 hours. Do not leave the Fiber Clear in the sand filter for more than 24 hours. When used in this manner, Fiber Clear will produce crystal clear pool water. When the water begins to get cloudy again, repeat the above procedure.

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Recent Comments:

  1. Irene Julius says:

    I have a sand filter and need to add fiber clear. How do I do that? do I open the top of the filter or put the product in the skimmer?

    • admin says:

      All that needs to be done is add the appropriate amount of Fiber Clear directly into the skimmer. If the diameter of your sand filter is 24”, then add the equivalent of a 16 oz. beverage cup (by volume). If your purchased a 9 oz. bag of Fiber Clear, this will equate to ¼ of that bag. If your filter is a smaller or larger diameter, consult the back of the bag of the dosage rate.

      With a sand filter, you will be filtering the 40 micron sand quality to 2 microns. Expect your pressure to rise faster during this polishing process, which will take 6-8 hours if your pump runs continuously. When your pressure reaches 10 psi above your normal pressure, simply backwash for 2-3 minutes, or until the effluent is clear. Add the same amount of Fiber Clear to the skimmer, and watch your pool water sparkle.

  2. Paul says:

    Hi. When you indicate above not to leave the FibreClear in the sand filter for longer than 24 hours, do you mean at first when it’s time to backwash, or anytime one uses FibreClear in their sand filter?


    • admin says:

      It is OK to leave Fiber in your pool from backwash to backwash as continuous filtration.

      Expect your first cycle to be shorter due to the Fiber Clear filtering finer particles that pass through the sand filter. When your pressure gauge registers about 10 psi above your normal operating pressure, backwash, then with the filter in the service position and pump running, add the se amount of Fiber Clear directly into the skimmer. At the end of this cycle you will have a 2 micron clarity in your water.

      If you desire additional information or dosage charts for your specific filter type send an email request to