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:
Opie Yutts Reviewed by Opie Yutts on . Awesome charts, conversions and info 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: Rating: 5