Pentair Lateral Assembly, ClearPro. A new, exclusive, patented technology that dramatically improves water clarity by 60%. Traditional sand filters can only remove particles in the 50-100 micron range, but ClearPro Technology® removes particles up to five times smaller, well below what your eye can detect. When combined with our popular Tagelus® sand filter, your pool will achieve 60% cleaner water than with other sand filters. However, Tagelus® remains blissfully simple, requiring less maintenance than either cartridge or D.E. filters. Just an occasional backwashing with a simple turn of a valve for the clearest water, year after year.