Consider
the following issues:
+
Material:
Plastic reservoirs are preferable. They are cheap, readily available and easy
to attach fittings. Food grade polyethylene is a durable and flexible
plastic that resists contaminating the nutrient solution with toxic
plasticizers.
+
Color:
Ensure plastic is black and/or opaque - this prevents light transmission
and reflection which can destabilize chelated trace elements and
encourage algae growth.
+
Shape:
Round
reservoirs are much easier to stir compared to rectangular or
square.
+
Lid: A
reservoir lid is essential to prevent light and dirt ingress, and to minimise
evaporation. However, position the lid ~2 inches above the reservoir to allow
aeration (Fig 6.5). Failure to do so will create a humid environment
that will encourage the growth of fungus or moulds.
+
Drainage: For
recirculating systems, the 'dumping' process can be simplified by
incorporating an inbuilt sump (Fig 6.1b) in the base
of the reservoir.
