In article ,
Hal wrote:

What is the difference in using a mix of bulk potassium nitrate,
potassium phosphate, potassium sulfate? Sounds like potassium comes
with everything and I wonder why, and if it works better?

Also consider:

ammonium nitrate
ammonium phosphate
ammonium sulfate
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18,000 gallon (17'x 47'x 2-4') lily pond garden in Zone 6
Cheers, Steve Henning in Reading, PA USA