At PoolSupply360 we sell only the finest quality replacement DE pool filter grids using the best components anywhere. The “skeleton” frames of the pool filter DE grids are constructed with a quality material to insure strength and stability and designed in a way that promotes efficient water flow. The fabric used to cover the pool filter grid skeleton is a quality virgin material that allows for optimum water flow while being woven in a way that maintains the highest strength and improves the life of the pool filter grid.Diatomaceous Earth (DE) Filters are the most effective filter. They can filter out particles as small as 5 microns. These filters have grids inside. DE filters require that grids be coated with DE powder. These grids are kept clean by periodically backwashing. Once backwashing is no longer effective, it is necessary to disassemble and clean the filter (generally twice each year). The average filter grid need to be replaced every 4 - 5 years. Grids are reasonably priced.