Filtration Performance: Turbidity & SDI Reduction, Particle Analysis nextSand vs. MultiMedia. - Case study
Water Source: Surface water (river water with silt and clay particles after a rain event in San Antonio).
Multimedia System. 36' bed depth comprised of #16 Garnet, #50 Garnet, 20x30 mesh sand and anthracite, operated at 12gpm/ft2.
next-Sand System. 1/4x1/8 gravel to cover hub and laterals, 36' bed depth of 14x40 mesh next-Sand operated at 12 gpm/ft2.
The tests were conducted over a 6 day period. Samples were taken daily. The tests performed were Turbidity, SDI (Silt Density Index) and particle analysis to characterize the filtration performance relative to particle size.
The particle analysis showed ihat next-Sand media performed as well as or better than most 5 micron cartridge filters. next-Sand operated at 1/2 the backwash frequency indicating twice the solids loading capacity of multimedia.