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BayFilter™

After more than seven years of research and development, BayFilter is the most efficient, effective, economical, and easy–to–use storm water treatment filter on the market today.

Specify BayFilter

BayFilter's unique cartridge design utilizes concrete (manholes, pre–cast, or cast–in–place) vaults housing cylindrical spiral–wrapped filter fabric containing a mixed silica/sand media. These proprietary components and BayFilter's exclusive layered construction achieve removal of very fine sediment and nutrient pollutants.

BayFilter is easy to specify, install, and maintain. Its up–flow technology employs a unique self–cleaning backwash component that dislodges pollutants and restores the porosity of the mixed media filter. A dedicated drain–down cartridge assures no standing water between storms.

*All claims are derived from 1200 data points using mass–balanced testing methodology.

How BayFilter Works

Spiral wound layers of sand filter and drainage media provides a large interface with the filter. Flow is forced through the filter media by alternating open drainage pathways. Four distinct flow and treatment conditions exist for the filter system:

  1. Vault fill and air purge
  2. Filter flow
  3. Siphon flow
  4. Siphon break and vault empty

Click the demo below for a full description:

Easy Installation

BayFilter systems are installed along with the storm drain. Installation procedures vary depending on the configuration you specify. Assistance is provided in designing for your particular BayFilter application. Whether your project mandates the Manhole BayFilter system or the Pre–cast Vault BayFilter system, you'll find guidelines for a quick and easy installation.

Custom designed BayFilter systems may have particular installation concerns that will be addressed and resolved during the initial design phase. Installation instructions and procedures for all custom BayFilter applications are included with the custom design documents.

Installing the Manhole BayFilter

  1. Contact utility locator to mark any nearby underground utilities and make sure it is safe to excavate.
  2. Reference the site plan and stake out the location of the BayFilter manhole.
  3. Excavate the hole, providing any sheeting and shoring necessary to comply with all federal, state and local safety regulations.
  4. Level the sub–grade to the proper elevation. Verify the elevation against the manhole dimensions, the invert elevations, and the site plans. Adjust the base aggregate, if necessary.
  5. Have the soil bearing capacity verified by a licensed engineer for the required load bearing capacity. On solid sub–grade, set the base of the BayFilter manhole.
  6. Check the level and elevation of the base unit to ensure it is correct before adding any riser sections.
  7. Add watertight seal (either mastic rope or rubber gasket) to the base unit of the BayFilter manhole. Set riser section(s) on the base unit.
  8. Install the PVC watertight outlet manifold within the BayFilter manhole.
  9. Install the inlet pipe to the BayFilter manhole.
  10. Install the energy dissipater level spreader at the system inlet location.
  11. After the site is stabilized, remove any accumulated sediment or debris from the manhole and install the BayFilter cartridges. 

Installing the Pre–cast Vault BayFilter

  1. Contact utility locator to mark any nearby underground utilities and make sure it is safe to excavate.
  2. Reference the site plan and stake out the location of the BayFilter vault.
  3. Excavate the hole, providing any sheeting and shoring necessary to comply with all federal, state and local safety regulations.
  4. Level the sub–grade to the proper elevation. Verify the elevation against the manhole dimensions, the invert elevations, and the site plans. Adjust the base aggregate, if necessary.
  5. Have the soil bearing capacity verified by a licensed/engineer for the required load bearing capacity. On solid sub–grade, set the first section of the BayFilter pre–cast vault.
  6. Check the level and elevation of the first section to ensure it is correct before adding any riser sections.
  7. If additional section(s) are required, add a watertight seal to the first section of the BayFilter vault. Set additional section(s) of the vault, adding a watertight seal to each joint.
  8. Install the PVC outlet manifold and outlet chamber system.
  9. Install the PVC outlet pipe in BayFilter vault.
  10. Install the inlet pipe to the BayFilter vault.
  11. Install the/energy dissipater/level spreader at the inlet pipe.
  12. After the site is stabilized, remove any accumulated sediment or debris from the vault and install the BayFilter cartridges.

Easy Inspection

When BayFilter is initially installed, we recommend that an inspection be preformed on the system in the first six (6) months. After that, the inspection cycle typically falls into a biannual pattern given normal storm occurrence and actual solids loads. Its easy access design, whether manhole or pre–cast vault, assures unobstructed and effortless on–the–spot inspection of any BayFilter system.

Easy Maintenance

The BayFilter system requires periodic maintenance to continue operating at its peak efficiency design. The maintenance process comprises the removal and replacement of each BayFilter cartridge and the cleaning of the vault or manhole with a vacuum truck. For best results, BayFilter maintenance should be performed by a certified maintenance contractor. A quick call to an ADS engineer or customer service representative will provide you with a list of reliable contractors in your area.

The maintenance cycle of the BayFilter system is driven mainly by the actual solids load on the filter. It is prudent to periodically monitor the system to be certain it is operating correctly. Since storm water solids loads can be variable, it is possible that the maintenance cycle could be more or less than the projected duration.

When BayFilter exhibits flows below design levels, the system should be inspected and maintained as soon as practical. Replacing a BayFilter cartridge should be considered at or above the level of the 4" collector pipes to the manifold.

The following maintenance procedures can also be found in the BayFilter System Technical and Design Manual.

BayFilter Maintenance Procedure

  1. Remove the manhole covers and open all access hatches.
  2. Before/entering the system make sure the air is safe per OSHA Standards or use a breathing apparatus. Use low O2, high CO, or other applicable warning devices per regulatory requirements.
  3. Using a vacuum truck, remove any liquid and sediments that can be removed prior to entry.
  4. Using a small lift or the boom of the vacuum truck, remove the used cartridges by lifting them out.
  5. Any cartridges that cannot be readily lifted can be easily slid along the floor to a location they can be lifted via a boom lift.
  6. When all the cartridges have been removed, it is now practical to remove the balance of the solids and water. Loosen the stainless clamps on the Fernco couplings for the manifold and remove the drainpipes as well. Carefully cap the manifold and the Fernco's and rinse the floor, washing away the balance of any remaining collected solids.
  7. Clean the manifold pipes, inspect, and reinstall.
  8. Install the exchange cartridges and close all covers.
  9. The used cartridges must be sent back to ADS for exchange/recycling and credit on undamaged units.