• bbuzunis
    Participant

    #648

    In Nicaragua we looked for fine relatively uniform sand. I basically picked the sand up and looked at a few grains on my thumb nail to guess the size was in the 0.1-0.2mm range. We took it out of the local river bed.

    Even in our lab experiements we never went out and found true filter sand which they use in most water treatment plants. What we did is went down to the local landscape supply yard. My experience has been that the system is quite robust in terms of sand. Of course the finer the better.

    We used window screen mainly as a first step to screening out any organic debris. Once we did that we spent some significant amount of time rinsing the sand out before installing it into the fitlers.

    Cheers

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    B. J. Buzunis, P.Eng

  • bbuzunisReply To: what type of screen for preparing fresh sand?