Aquascape AquaBlox (29492) - Manual (Page 9)

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The AquaBlox ® can be covered with a layer of 1 ½” or larger decorative
gravel. Boulders can be placed around the perimeter of the water storage
basin to complete the edges of the basin. The liner edges can be trimmed
to at least 3” above the maximum water level in the basin and backfilled
behind the boulders.
Step 11: Backfill Top and Finish Edges
Permeable paver applications installed on top of the water storage basin
require a woven geotextile (Item #30219). The geotextile is laid directly
on top of the exposed AquaBlox ® . This will provide a base for the paver
screening to be spread.
Note: Do not use the inner and outer non-woven geotextile
(underlayment) on top of the AquaBlox ® as it will potentially clog.
The built-in water level inspection port on the Pondless ® Waterfall Vault
allows the lid of the Pondless ® Waterfall Vault to be buried.