Step 1

Determine the Location and Overflow Into the Pond

• Before excavating, position the Snorkel^® Vault V2 and AquaBlox^® A panels, then outline the excavation with marking paint as a guide.
• Excavate at least 6 in. (152 mm) extra on each side of the basin to allow adequate backfill and compaction; add more if needed for larger filters or aesthetics.
• Mark excavation limits to fit the Snorkel Vault V2, AquaBlox, Centipede^® Modules V2, Centipede End Cap V2, required backfill, and any added space for aesthetic/design needs.

Step 2

Reference for Proper Depth

Excavate based on desired layout and filter size.

Multiple Snorkel Vaults V2 can be installed side by side to create larger filters. View this step.

Note: Use Snorkel Vault Extensions V2 to increase height when using multiple layers of FilterBlox, AquaBlox Large Storage Modules for a deeper sedimentation layer, deeper gravel beds or other purposes.

Step 3

Prepare Base

Note: There should be a minimum of 6 in. of space between the sides of the AquaBlox and the vertical wall of the excavation to allow adequate backfill and compaction.

• First, dig the main excavation as shown.
• Next, excavate the Snorkel Vault V2/Centipede V2 as shown.
• The base of the excavation should be smooth soil, flat and free of lumps and debris.
• Add compactable material such as sand, if existing soil conditions do not meet requirements listed above. The compactable material should be spread to a 4 in.(102 mm) minimum depth and compacted. If you install a 4 in. (102 mm) compacted base layer, over-excavate an additional 4 in. (102 mm) so the finished excavation elevations and dimensions remain correct.

Step 4

Install Geotextile Underlayment

• Verify the excavation by test fitting the AquaBlox in the excavation before installing underlayment.
  Note: There should be a minimum of 6 in. (152 mm) between the AquaBlox and the vertical wall of the excavation to allow adequate backfill and compaction. Additional space can be added to the sides if needed for larger filters or aesthetics.
• Place underlayment in the excavation, covering the bottom and sides.
• Overlap multiple underlayment sections as needed for complete coverage.

Step 5

Install EPDM Liner

• Lay the liner into the excavation and position to cover entire storage basin.
• Before trimming, confirm you will still have enough liner left to create a proper overlap or seam at the return connection so water returning from the filter cannot track behind the liner.
• It is recommended to add an additional layer of underlayment on top of the liner to further protect the liner from damage.

Step 6

Install Equipment

• Set the Snorkel Vault V2 securely in the lined excavation and check for level.
  Note: Add a small layer of fine gravel beneath the Centipede V2 as shown.

• Connect each Centipede V2 onto the Snorkel Vault V2 and check for level. Multiple Centipede Modules V2 can be connected in series depending on desired filter size.

• Once all Centipedes V2 are installed, connect the Centipede End Cap V2.

• The Centipede End Cap V2 allows plumbing connections from the top or end as needed; drill points are marked with an "X" to indicate center.

• Plumbing connection can be completed through a variety of methods, including Rubber Bulkhead.
• Rubber Bulkhead: Drill with the correct hole saw size, insert the rubber bulkhead, lubricate it with silicone grease, then insert the pipe.
  Note: Install the pipe securely so it seats far enough into the end cap to prevent disconnection, but when entering from the top do not insert it so deeply that it contacts the bottom of the end cap. When installing at the top connection point: if desired, add an elbow facing the Centipede to direct flow.
• Connect the Snorkel Lid V2 as shown.

Step 7

Prepare and Install AquaBlox

• AquaBlox Storage Modules are placed atop the Centipede V2 for proper sedimentation and even distribution before water enters the FilterBlox Modules.
• Assemble the AquaBlox securely using a rubber mallet.
• Install AquaBlox in the storage basin, butting them tightly against each other.
  Note: Ensure AquaBlox are installed in the correct orientation to ensure maximum load-bearing capacity.

Step 8

Install FilterBlox

Place FilterBlox Modules on top of the AquaBlox Storage Modules, butting them tightly against each other.

Step 9

Backfill Sides

• Backfill evenly on all sides of the AquaBlox and FilterBlox to secure the components and improve drainage.
• Inside the liner: use gravel larger than 1.5 in. (40 mm) to backfill between the filter components and the inner geotextile.
• If backfilling outside the liner, use sand or compactable soil between the outer geotextile and the liner.
• It is important to distribute backfill evenly around the basin perimeter, working up to final grade to prevent module shifting.

Step 10

Add Gravel

• The installation can now be covered with a layer of decorative gravel.
• It is recommended to use gravel 1.5" (38.1 mm) or larger on top of the FilterBlox modules to prevent gravel from falling into the FilterBlox.

• Boulders can be placed around the perimeter of the water storage basin to complete the edges of the basin.

Note: When setting flat-bottomed rocks on top of the FilterBlox, use a layer of gravel or Flo-Cell Panel to prevent water up-flow blockage.

• Trim liner edges to at least 3 in. (76 mm) above the basin's maximum water level, then backfill behind the boulders.