Grains that are too large won’t get pushed out of the filter, but they are also less effective at properly filtering small particles. If the grains are too small then the flow of water through the filter can actually sweep them up and push a large portion of the sand into the pool instead of cleaning the water. In order for a sand filter to work properly, it needs grains of sand that are the appropriate size. The grain size of pool filter sand can be measured in inches, but due to the size of the sand, it’s easier to express it in millimeters. This is because while algae is often 30 microns in size, algae spores can be much smaller, allowing them to slip through silica sand and create new problems in the pool. This alternative to silica sand is made from recycled glass and can capture debris as small as 3 to 5 microns in size, making it a good option for pools that have recurring algae problems. Glass pool filter sand is the best option for removing very small particles from the pool water.However, zeolite sand is also capable of binding with chloramines to help maintain the chlorine balance in the pool water. Zeolite pool filter sand is made from volcanic rock minerals and can filter debris as small as 10 microns, giving it a slight edge over silica pool filter sand.Silica sand is made with ground quartz, and it has rough edges to help trap particulates. It’s inexpensive, easy to find, and can filter particles down to 20 microns, which is approximately 0.0008 inches. Silica pool filter sand is the most commonly used type. Good pool filter sand can come in three common types that are designed to effectively trap dirt and debris to keep the pool water clean, including silica, zeolite, and glass sand. Read on to find more important shopping tips and details about essential product features. Consider the grain size, quantity of sand, and whether it’s compatible with above-ground or in-ground pool filtration systems. Photo: What to Consider When Choosing the Best Pool Filter Sandīefore choosing the best pool filter sand for your sand filter, it’s crucial to determine the type of sand that would be ideal for your pool.
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