u will have to go by the size of the uniseals u ordered for the pipe size but with the size of the pots ur using i'd use 40mm pipe min.
i had a 10 pot system with a 5000l pump and that was overkill so i'd start with running ur pump on the min setting.
im sure i fitted my flow and return pipes 75mm up from the bottom of the pot.
i always keep my water level with the bottom of the net pot, seem to get alot better roots
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