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Sand Filter Media - A Layman's Guide to Clean Water Sand Filter Media. Selecting and preparing the required sand and gravel for a biosand filter is crucial for the treatment efficiency of the biosand filter. Note: The content on this page has been adapted from publications of the Centre for Affordable Water and Sanitation Technology (CAWST). How to Clean a Pool Sand Filter | DoItYourself Doing an annual cleaning maintenance of a swimming pool sand filter helps to keep the pool in good condition for a long time. The kind of sand used in the swimming pool filter is a specialized kind of sand which appears to be unpurified, rough and sharp. Happy Koi - Happy Koi - Koi keeping done right!Sand filters Sand Filters and Koi ponds... Have you been advised that a sand filter is the way to go to provide good mechanical filtration for your Koi pond? Sand filters are arguably one of the worst filters things that you can inflict on your Koi. There is a cure that will help you enormously. Check out the new prefilters.    Read More