Why do more and more people choose to use fiber balls for water treatment? Why is sand gradually replaced by fiber balls?

Now people pay more attention to their health. When sand is used to filter the pool water, there will be residues at the bottom of the pool. However, if fiber filter ball is used to filter, there will be no sand at the bottom of the pool. At the same time, 700g filter ball can replace 25kg sand. The filtration accuracy of fiber filter ball can reach 3 microns, which is 5 times of that of sand. The filter ball also has the function of backwashing. When the filter ball is used for a long time,