Grow bed depth in a media based aquaponics system is a subject not without a little controversy. the majority of media-based aquaponic growers will say that you should have about 12″ (300 mm) of media, with the top 1 – 2″ being left dry to reduce algae and fungal growth.. For example, for a media bed of 1000 litres (dimensions 2 m long × 2 m wide × 0.25 m medium depth), the growing medium will displace 300–600 litres of this space, and therefore the water volume of the media bed would be 400–700 litres..
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