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After each dive in salt water
To avoid unnecessary wear on the drone and tether, after each dive in salt
water, the drone and tether must be rinsed with fresh water.
The drone can either be submerged in fresh water or rinsed with a garden
hose. Running the thrusters submerged in fresh water after each dive will keep
them in shape longer.
The tether can be rinsed inside the tether bag, just remember to remove the
Surface Unit away from the bag.
Instructions for changing propellers can be found at
support.blueyerobotics.com