BayFilter
Design Manual
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TABLE OF CONTENTS
INTRODUCTION ............................... 2
BAYFILTER ................................... 3
BASIC PRINCIPLES OF FILTRATION...............4
BAYFILTER PRODUCTS ......................... 6
BAYFILTER OPERATION ........................ 8
SYSTEM DESIGN & SIZING ..................... 10
INSTALLATION ............................... 15
INSPECTION & MAINTENANCE .................. 17
AVAILABILITY & COST ......................... 18
BAYFILTER SPECIFICATIONS . . . . . . . . . . . . . . . . . . . 18
INTRODUCTION
Clean water is essential to quality of life. BaySaver Technologies is 100% committed to minimizing pollution in
stormwater which helps protect our water resources. By collaborating with the regulatory and engineering community
to develop products and processes, BaySaver continually develops state of the art stormwater filters that are proven
to effectively remove pollutants such as sediments, phosphorous, metals, nitrogen, trash, and hydrocarbons.
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BAYFILTER
The BayFilter cartridge system is an ongoing commitment to state of the art stormwater treatment. The compound
spiral media configuration allows for a large filter surface area in a compact footprint. This configuration results
in the most efficient and effective stormwater filter available in the marketplace. The BayFilter is available in
multiple sizes with multiple media configurations to meet any flow rate and design consideration while being able
to target specific pollutants. A BayFilter System is typically a concrete structure (precast vault, manhole, or cast
in place structure) with a single or multiple BayFilter cartridges. Inside the structure the BayFilters are connected to
an outlet manifold through which the treated water exits the system.
Plan View
BayFilter Cutaway
Profile View
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BASIC PRINCIPLES OF STORMWATER FILTRATION
Stormwater treatment has unique requirements, which
often require the treatment of large volumes of water at
relatively high flow rates to high levels of pollutant removal
with long periods of time between maintenance intervals.
At BaySaver we believe it is our responsibility to engineer
a balance within these variables to provide effective
stormwater treatment at an exceptional value to our clients.
What makes for an effective and efficient stormwater filter?
A filter must be able to remove the pollutants of concern
and function for a reasonable period of time as defined by
industry and regulatory standards. A filter system should also
be designed to limit re-suspension or release of pollutants
that have been collected between maintenance periods.
The traditional pollutants of concern in stormwater is
sediment. Phosphorous, metals, turbidity, nitrogen, fecal
coliform, and bacteria are also pollutants of concern although
they are not commonly regulated nationwide. BaySaver
Technologies has completed both field and laboratory testing
of the BayFilter. Testing demonstrates BayFilter’s effectiveness
and efficiency at capturing the pollutants listed above.
Figure 1: Coarse Industry Media
Settling and filtration are the two primary methods to
remove pollutants from stormwater. Some settling of
particles and pollutants occurs as the influent enters the
filter vault. Settling typically removes the larger particles
and debris, it does not remove the small particles or any
dissolved materials. It is the filter which performs the
work of removing the very small particles, and dissolved
nutrients and metals. The media within a filter must be small
enough to intercept the tiny sediment particles which won’t
settle (fig. 1), and be capable of attracting and attaching
charged and elemental particles through ion exchange.
The area of media provided by a stormwater filter is an
important factor to consider when selecting and specifying a
filter system. The more surface area provided by the media,
the greater the potential flow through and across the media
and the greater the pollutant removal potential of the filter.
The vertically oriented and patented compound spiral media
Figure 2: BayFilter Media
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configuration of the BayFilter maximizes a media filter’s area
potential. The particle size of the media is also important with
respect to pollutant interception and adsorption. A tightly
packed, fine media (fig 2) captures a greater percentage of
fine and dissolved pollutants when compared to a loosely
packed, coarse media or a membrane media. A fine and
tightly packed media not only minimizes the interstitial
spaces between the media particles to optimize interception
of pollutants, it also maximizes the amount of surface area
in a given volume provided by the media for ion exchange.
The quantity of sediment a filter is capable of capturing is
a significant component to filter longevity. A filter must be
able to treat large quantities of sediment while maintaining
claimed flow rates and removal efficiencies. The sediment
loading capacity of the BayFilter is 350 pounds (158.7 kg) for
the 45 gpm (170.3 lpm) and 30 gpm (113.6 lpm) cartridges.
Surface area and loading rate contribute significantly to filter
longevity. Greater filter surface area (sf) allows for a reduced
loading rate (gpm/sf of filter media), which in turn increases the
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service life of the filter. For example, a 10 square foot (0.9 m
)
filter with a loading rate of 1 GPM (3.8 l/min) per square foot
of filter area will pass 10 GPM (37.9 l/min). A 20 ft2 filter with a
loading rate of 0.5 GPM (1.9 l/min) per square foot of filter area
will also pass 10 GPM (37.9 l/min). If one gallon of treated water
will occlude one square foot of filter area every 10 days, a 10 ft
(0.9 m2) filter flowing at one GPM (3.8 l/min) will be expired in
100 days. A 20 ft2 (1.9 m2) filter flowing at 0.5 GPM (1.9 l/min)
will be expired in 400 days. Increasing media area and
reducing flow rate has a beneficial impact on pollutant removal
and filter longevity and these are some of the core engineering
principles on which the BayFilter design is based.
BaySaver Technologies is committed to the purpose of
protecting public waterways. Permanently capturing
pollutants, effectively backwashing media, allowing media to
drain between storm events, and providing an economically
reasonable maintenance interval are key design parameters
for properly functioning stormwater filtration systems. The
BayFilter cartridge system helps meet and exceed these
key requirements needed to protect our water resources.
Top of Cartridge
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Bottom of Cartridge
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BAYFILTER PRODUCT DETAILS
BayFilter 545
Size = 28” (711 mm) diameter
Weight = 250 lbs. (113 kg)
2
Media Area = 90 ft
(8.4 m2)
Flow Rate = 45 gpm (170 l/min)
2
Flow Rate per Square Foot = 0.50 gpm/ft
(20 l/min/m2)
Minimum Operational Head = 32” (813 mm)
Recommended Design Head = 34” (864 mm)
Sediment Capture Capacity = 350 lbs (159 kg)
Manifold Diameter = 6” (152 mm)
BayFilter 530*
Size = 28” (711 mm) diameter
Weight = 250 lbs. (113 kg)
Media Area = 90 ft2 (8.4 m2)
Flow Rate = 30 gpm (114 l/min)
Flow Rate per Square Foot = 0.33 gpm/ft2 (13 l/min/m2)
Minimum Operational Head = 30” (762 mm)
Recommended Design Head = 32” (813 mm)
Sediment Capture Capacity = 350 lbs (159 kg)
Manifold Diameter = 4” (102 mm)
BayFilter 545
BayFilter 530
BayFilter 522**
Size = 28” (711 mm) diameter
Weight = 125 lbs. (57 kg)
Media Area = 45 ft
2
(4.2 m2)
Flow Rate = 22.5 gpm (85 l/min)
2
Flow Rate per Square Foot = 0.50 gpm/ft
(20 l/min/m2)
Minimum Operational Head = 18” (457 mm)
Recommended Design Head = 20” (508 mm)
Sediment Capture Capacity = 175 lbs (79 kg)
Manifold Diameter = 3” (76 mm)
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BayFilter 522
NOTES: The 500 series is for
Total Suspended Solids (TSS) and
Phosphorous and utilizes EMC media.
*BayFilter 530 replaces BFC cartridge.
** BayFilter 522 replaces 545L cartridge.
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