Why do I have to backwash and rinse three times when I first install Zelbrite?
As with new sand, you must backwash two or three times to clean out any dust. With Zelbrite the three backwash and rinse cycles ensures that any adhering clay is removed, and importantly, the different particle sizes are separated – the finer material rising to the top of the filter tank and the coarser grains settling to the bottom covering the laterals.
