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It appears to me that the "discard hose" was not connected tight and leaked. This connection is not high pressure, but pressure can build up if the valve below is turned off.
I cannot be sure without testing, but I believe that you can clean up this pipe where the hose connects (green circle) and reconnect the hose using silicone sealant on the pipe and 2 hose clamps. I would also use a steel brush to remove the corrosion and treat the metal with CorrosionX. This part will get dissimilar metal corrosion (red circle) in all Dessalator watermakers and should be coated with CossosionX by brushing-on.
This is the cause of the dissimilar metal corrosion:
As an alternative, you can contact Dessalator. They can supply you with a new part. Dessalator <contact@...>
I hope this helps.