More cost-effective method than media
beds on large scale
Large water volume dampens changes in
water quality
Can withstand short interruptions in
electricity
Minimal water loss by evaporation
Well researched by commercial
hydroponic ventures
Polystyrene rafts insulate water from
heat losses/gains keeping constant
temperatures
Shifting rafts can facilitate planting and
harvest
Rafts provide biofilter surface area
DWC canals can be fixed with plastic
liners using almost any kind of wall
(wood, steel frames, metal profiles)
Can be used at multiple stocking densities