About normal pool filter balls:

1.it's easy to back wash. You can even wash it by hand or machine.

2.Then its filtration accuracy is very high,more than 3-5 microns,it's 3 to 5 times that of quartz sand.

3.It's very light. 700 grams is equivalent to twenty-five kilograms quartz sand.

4.Its resistance is very good, such as acid,alkali,light,wear,microbial resistance. It has a large dirt concentration , can be recycled , time-saving and efficient, so its life service is very long , you can replace them once a year.

5.It's elastic and the porosity distribution is small.