an internal bypass design with custom system footprints ranging from 4 x 4 feet
to 8 x 8 feet (16 to 64 square feet). An optional cylindrically shaped Bio-Filter
TM
model uses an external bypass structure(s) in lieu of the internal bypass, having
similar surface areas as the standard models.
All Bio-Filter
TM
systems use a 3 inch top layer of mulch underlain by 18 or 24
inches of engineered biomedia, and an 8 inch gravel base containing an
underdrain pipe. Two 15-inch diameter metal access port covers to the Trash
Shelf, Pretreatment Chamber and Underdrain Pipe are also included for each
unit. A metal tree grate is available in several colors and patterns. A non-skid
surface material is used for the top of the unit and can be applied to the unit’s
sides on request. No heavy lifting equipment is needed for installation. All filter
media is typically shipped separately, and replacement biomedia is available from
AquaShield
TM
. AquaShield
TM
is not responsible for tree specification, purchase,
delivery, installation or maintenance.
Bio-Filter
TM
Media Installation
After the Bio-Filter
™
is installed and before media installation, ensure that the
filtration chamber is free from debris and that the perforated underdrain pipe is
connected and in place (refer to SHOP drawing).
The first step in media installation is to fill the bottom 8 inches of the filtration
chamber with gravel (contractor furnished). Fill to the one inch flatbar
reinforcements that are attached to the front and back chamber walls at this
elevation. The top of the gravel bed should be smooth and level and the
underdrain pipe should be fully covered.
A layer of geotextile fabric (contractor furnished) is lain on top of the gravel bed.
Fabric should be smooth and cover the entire surface to the filtration chamber
walls.
Next the AquaShield
™
Bio-Filter
™
media is installed. The soil matrix should be
installed in 6 inch lifts and the surface of each lift smoothed and leveled before
proceeding to the next lift. Media should be filled to the upper 1-inch flatbar
reinforcements on the front and back filtration chamber walls.
At this point a solid cover should be placed over the tree grate opening and the
curb inlet blocked off to minimize construction debris from contaminating the
Bio-Filter
™
media bed during the final site construction phases.
