Pond Boss Forums MANAGING AN EXISTING POND Fertilization which Fertilizer?

To my limited knowledge of the topic I know of no good chart. IMO this is due to the wide differences and variations in water bodies - too many variables for a simple chart. Most often the high P concentration mixture that GG mentioned works well. IMO one of the most important things to do when going to fertilize is FIRST make sure the alkalinity of the water body is at least at the minimim concentration which I think is 50mg/l (50ppm). When exceptions or no bloom occurs then one has to start looking at most probable reasons.