11
SETTING THE FASTFALLS
Place the Pro Series FastFalls on a level bed of undisturbed soil if possible, to avoid settling.
If installing above existing grade, compact the area thoroughly. This critical step will ensure
that the FastFalls will not settle out of level over time. Blocks or bricks set on virgin soil can
also be used to raise the FastFalls while reducing the chance of settling.
Place the FastFalls right at the basin’s edge to create a single dramatic fall, or pull the
FastFalls back from the edge to create a stream. Leave plenty of liner around the FastFalls to
make it easy to camouflage with rock later.
To ensure a leak-proof installation, test place the FastFalls in the desired
location and level it from side-to-side and front-to-back. The closed design of the FastFalls
ensures that water will only exit the unit over the spillway, so there is no need to tilt the
FastFalls forward.
Pro Series FastFalls Installation
Figure 14.
When you are satisfied with the
placement of the FastFalls, remove the
unit and install the liner and underlayment,
being careful not to disturb the level base.
Place the FastFalls on top of the liner in its
original position. Check the unit for level to
ensure that nothing has changed. Once the
FastFalls is level and positioned correctly,
place a couple of large stones on top of the
FastFalls. This will ensure that the FastFalls does
not move when backfilling and attaching liner (Figure 14).
LINER AND PLUMBING ATTACHMENT
Hold the liner up against the flat panel on the back of the FastFalls enclosure. Leave some
excess slack in the liner below the spinweld. This will help alleviate any future strain on the
liner connection. Make sure the back surface of the FastFalls, and the back side of the liner is
clean and free of debris. Once you are satisfied with the position of the liner, lower it down and
prepare to apply the silicone sealant (Figure 15).
Figure 15.
Apply Atlantic’s Silicone Sealant in a continuous, consistent bead along the center of the
threaded inserts. Once completed, return the liner to its dry-fit position.
Attach the supplied flange to the FastFalls, starting with the top screw first, working around
the flange. If needed, use an awl or nail to pierce the liner before inserting the screws. Do not
fully tighten any screws until all of the screws have been installed. Once completed, trim away
the liner on the inside of the flange (Figure 16).