The
feed circuit, especially restrictive outlets (e.g. drippers), can become
blocked with salt buildup, dirt, algae, root growth, medium, etc. To
minimize this problem:
+
Employ a filter on inlet to the nutrient pump. Also, in re-circulating
systems install a filter in the return line (Fig 6.6).
+
Position plants to avoid roots being drawn into drain outlets.
+
Maintain nutrient pH below 6.5 to help prevent precipitation.
+
Routinely disinfect the nutrient solution to prevent the buildup of
algae/ slimes.
+
Ensure nutrients are fully soluble/ dissolved.
+
Use stakes to secure outlets above and away from medium and roots to
prevent them from becoming blocked.
+
Where drippers or sprayers are used, allocate at least 2 outlets per
plant and inspect/clean regularly.
+
Use a regular maintenance schedule. Routine 'dumping' and 'flushing' will
help prevent the buildup of solids (insoluble salts, algae, plant debris).
Over the long-term, it is sometimes useful to perform a chemical flush to
remove insoluble precipitates – see “System
clean-up between crops”.
