Electrical supply from mains board, it helps having a brother who can frame as well as being an electrical contractor!!!!!!
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The top up and water change will be carried out in the mechanical room with an RO unit plumbed into the mains supply, a bit more framing and the tanks were installed.
The display tank in the wall and the top up system are connected by a pipe in which all of the plumbing runs, it can be seen to the right and top of the frame holding the top up tanks:
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