Wave Fitness Neptune Owner's Manual - page 6
Removing/Changing water on the Neptune Rower
Removing Tank Water:
1. Remove tank plug.
2. Insert rigid end of siphon into the tank, and flexible hose
into a large bucket. Note: If the siphon hose hits the impeller
blades, you can rotate the blades slightly by pulling on the rower
handle to allow the siphon to reach the bottom of the tank.
3. Drain tank and then refill following directions for Tank filling.
Note: The valve on top of the siphon must be closed to allow
proper drainage.
Note: The amount of time between water treatments will vary
greatly depending on the tanks exposure to sunlight. A good rule
of thumb would be from 6 months (if exposed to sunlight near a
window, for example) to 2 years or more in a less-sunlit location
.