Aloha Iron Pete,
8000 something kilometers. Quite a distance.
http://www.homehydrosystems.com/index.html
This is an informative site that has many different types of systems and nutrition info. I watch too many Utube videos, I do enjoy MHP gardener. I have gotten more information on this site than anywhere. Organic (to me) has become a huge scam from what I see. Picking the one that works, is what I'm after. Thanks for your kindness and best wishes from Hawaii
Tom