Pentair Versaflex GD

The Versaflex Gradient Density design combines selective final filtration with appropriate pre-filtration to achieve up to three times the dirt-holding capacity of similar size sediment cartridges and even greater capacity than standard spun-bonded cartridges.
Versaflex Gradient Density Cartridges are sized for use in Big Blue filter housings and will not impart taste, odor or color to the liquid being filtered.
Melt blow gradient density from outer to inner surfaces
Increased effective filter depth of 233%
Designed for purity and chemical compatibility