If you can get a EC meter, yes it would be better to have that, but if they have already sent it out, its not that big of a deal.

I am not super familar with sodium and don't want to give you incorrect advise, from what I remember it is bad for your plants. I am not sure at what levels it becomes a problem though.

Might want to do a little research on the subject, if you find some interesting articles, post them up here too.:thumbsup:
MimbresValley Reviewed by MimbresValley on . Hydroponics made simple, By MimbresValley Greetings, If any fellow NMMJ patient needs help, feel free to contact me here. (my yahoo sign in is listed under the about me/contact info.) There are many types of hydroponics, I will be touching on DWC today. DWC, also known as Deep Water Culture, & Death Without Cause. lol I will be demonstrating a very simple, and cheap hydroponic setup geared towards personal growers who do not need huge harvests, and also need a low initial cost. If this is your first time doing hydroponics, I Rating: 5