The Tetra DeepBed tertiary filtration
system provides superior total
phosphorus removal to limits below
0.2 mg/L. Rounded sand grains
with a sphericity of at least 0.8 are
used in the system and a 6-ft media
bed allows for up to 2 lb of solids
per square foot of filter surface area
before backwashing is required. The
sand media sizes in the 2- to 3-mm
range and a maximum uniformity
coefficient of 1.4.