What are the characteristics of a good substrate in hydroponic gardening?

  1. The substrate must be made of particles which are no larger than 7mm and no smaller than 2mm.
  2. It should be capable of moisture maintenance and draining of liquid which is excess.
  3. The material must not decompose easily.
  4. It should not hold micro organisms which are hazardous to human or plant health.
  5. It should not be contaminated with the residual waste which came from the industries.
  6. It should be available always.
  7. It should be portable.
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