onsen 3.0 Guide D'utilisation page 12

Perform the following steps to properly drain the system:
1 Drain the water tank. If the tank doesn't have a drain valve, open all
water fixtures and allow the pump to operate until the tank is empty.
Do not operate the pump for longer than 15 minutes continuously.
2 Switch OFF power to the pump and make sure that all water in the
drain lines is evacuated.
3
Remove the quick connect inlet and outlet fittings from the pump
and switch ON power to the pump to remove any remaining water
from the pump head. Switch OFF power to the pump and leave the
fittings disconnected from the pump until the system is ready to be
used again.
4
All fixtures must be left open to safeguard against any damage to the
plumbing.
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