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I stumbled accross this site and thought I would share. Engineering ToolBox
Lot's of cool info that can be used for weed farming. Some basic some advanced.
For example, did you know that a 90 degree elbow in a 4 inch duct is the equivilant of about 7 feet of strait run? Or you can lower PH using lemon juice or vinegar, which are about 3 PH. You can raise PH with baking soda or bleach, which are 9 and 13 respectively.
Stuff like this and much, much more:
Will adding any of those solutions effect the nutrients? I'm living by the Baltic sea right now and I wouldn't even walk in that water let alone put it in my reservoir. Battery acid, oven cleaner, drain cleaner?
Of course I would not feed my plants battery acid, but many people use lemon juice, vinegar, baking soda and bleach. I am very poor at geography, but doesn't the Baltic sea have a bunch of sodium (salt) in it? Or were you even suggesting using it for horticulture?
cool, something else to read.