![]() But there are a couple things to keep in mind if you’re considering zeolite as a filtration media. Zeolite boasts to filter down to 5 microns clearly making it a superior filtering media to the silica sand. Without getting too technical, zeolites are microporous and the voids in the media are ideal for catching debris flowing through your filter. ![]() Natural zeolites form where volcanic rocks and ash layers react with alkaline groundwater. We are finding that using a glass media not only gives you superior filtering for better water clarity, but it lasts longer. The other thing you need to know is that the average silica sand will last 3-5 years depending on pool usage and the foliage around the pool. So, silica sand will get some algae, but if you have an outbreak it will be necessary to use a clarifier to group the algae cells together in order to get it caught in the filter. Volvox can get huge–up to 500 microns (half a millimeter–visible to the naked eye). One thing to keep in mind is that the dreaded unicellular green algae are 5-10 microns in diameter, not including the flagella (add an extra 10-30 microns for the flagella). As you can see from our chart above it will take care of most suspended solids in the pool water. Number 20 silica sand will filter down to 20 microns. Not all sand is created equal and if you are going to replace your old media with sand, silica sand is the way you need to go. Silica sand is the oldest of the filtering medias. For more information go to let’s talk the major players in filtering media. WARNING: This product can expose you to crystalline silica, which is known to the State of California to cause cancer.
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