I remember you said in one of the other theads that it is common for ponds to lack potassium which green floaters need. Instead of buying liquid fertilizer for ponds ,what do you think of buying 0-0-60 fertilizer from a farm supply store and adding it in small amounts. I was thinking of experimenting with a feeder goldfish in an aquarium this winter. The man at the store said it wouldn't hurt fish cause it is a natural mineral mined from the ground. But then I thought, "so is oil". Wayne

Oil is not a mineral but it certainly comes from the ground and is natural. Before I would ever add a chemical to a pond or aquarium, I would want to see a list of the actual ingredients. If, for example, this fertilizer is just potassium salts, it should be okay at low doses in ponds and aquariums. Potassium can be in different forms such as potassium phosphate, potassium sulfate, potassium nitrate, etc. If you added potassium nitrate, the tank/pond would then also have more nitrate (and more plant and algae growth). So, you need to know the chemical buddy or mate that goes with potassium. It doesn't hang by itself. You want to also be sure that they didn't add other chemicals and/or what they are.

Thanks Robyn. I took your advice and called the manufactuer . They said this product,0-0-60 is potash and contains clorine so I will not use it in the pond.I was just looking for an economical way to fertilize floaters without turning the water green.

Potash is mostly potassium carbonate but may contain potassium chloride or potassium oxide. Potassium carbonate will raise the carbonate hardness. Potassium chloride, not chlorine which is not really dangerous at low levels. Sodium chloride (regular salt) also has chloride obviously.