#-#-# just means how much NPK it has in it (Nitrogen-Phosphorus-Potassium[Potash]
N is good for vegetive growth, so ya want lots of that before yah are flowering. Considering the bottle was only $2, I would not use it. In the general sense, the more something cost, the better it is. Not always though.
I personally would only use an all-purpose if I were growing something automatic, like lowryder or automatic ak47, etc.
"[FONT=Arial, Helvetica, sans-serif]Nutrient values (N-P-K)are expressed as total percentage of weight as packaged. Organic nutrients typically tend to have lower npk values than chemical nutrients. Don't let this fool you, you can easily burn plants if you overfertilize! [/FONT] [FONT=Arial, Helvetica, sans-serif]Powder nutrients tend to have higher NPK values than liquid nutrients because they are not already partially diluted with water. Do not let low N-P-K values fool you, what really matters is how strong these nutrients are when diluted to recommended levels ie: thier tds/ppm/ms/eC/cf. For example SuperVeg will give you a tds of around 1000 ppm when used according to directions, while Aquafeed "V" Powder will have a tds of around 600 ppm if used as recommended"
-http://www.living-learning.com/faq/npk.htm
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N = Nitrogen 7-9-5
Nitrogen is the first major element responsible for the vegetative growth of plants above ground. With a good supply, plants grow sturdily and mature rapidly, with rich, dark green foliage.
P = Phosphorus 7-9-5
The second major element in plant nutrition, phosphorus is essential for healthy growth, strong roots, fruit and flower development, and greater resistance to disease.
K = Potassium (Potash) 7-9-5 The third major plant nutrient, potassium oxide is essential for the development of strong plants. It helps plants to resist diseases, protects them from the cold and protects during dry weather by preventing excessive water loss."
