If the ppm's and conductivity numbers are kept within reasonable levels, and the plants are healthy, is it still advisable to use a leaching solution on them every once and a while? If so, how often?

Also, by the way, what are good guidelines to go by as far as EC numbers? I understand 5.8-6.0 is good for ph, I am not sure about EC though.

Any good online guides or even books anyone can recommend on the subject? Thanks in advance.
Satellite Reviewed by Satellite on . Leaching solution necessary? Recommended? If the ppm's and conductivity numbers are kept within reasonable levels, and the plants are healthy, is it still advisable to use a leaching solution on them every once and a while? If so, how often? Also, by the way, what are good guidelines to go by as far as EC numbers? I understand 5.8-6.0 is good for ph, I am not sure about EC though. Any good online guides or even books anyone can recommend on the subject? Thanks in advance. Rating: 5