Thank you for your reply. Never heard of EC meters before so I will google it and start learning on this but if you know a good place to start, please let me know. I fail to understand the concept of "You need to check the ppm of the discharge of the drain water before giving it fertilizer." you mentioned."
I may be asking too much but do you use a particular meter that you like?
This is my wife's garden but I like plants also. thanks