Sundance Spas Spas Installation Instructions Manual page 7

Blower Loop—
than the maximum water level of any spa besides a Sundance spa,
measures must be taken to keep water from backing up into the air
blower. When connecting the pipe from the air blower to the spa, route
the pipe so that it rises at least 12 inches above the maximum water
level of the spa. This raised "loop" can be located anywhere between
the spa and the air blower, however, it is generally preferable to locate
it as close to the spa as possible. Do not plan to rely on a check valve
as sole protection against water back up as they can fail over time.
(NOTE: This loop is not required on Sundance spas because they
contain built-in protection against the possibility of water backing up
into the air blower.
Isolation Valves—
level, consider installing valves in the water pipes on both the suction
and discharge sides of the equipment system so that the system can
be isolated for serving without draining the spa.
Drain Valve—
periodic draining the spa is to use a submersible pump. However, for
the owner's convenience, some installers install a valve or valves on
the discharge side of the single-speed pump to provide a means of
draining the spa.
IMPORTANT: Provide specific instructions to the owner regarding
proper draining procedures.
Connecting The Ozone Supply Tube
See instructions supplied with the spa shell.
If the equipment system is installed at a level lower
In cases where equipment is below the water
The simplest method for the spa owner to employ
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