I have recently rec'd two very positive feedback messages regarding a source for small quantities of Potassium Permanganate. I had been giving out this source as a possibility, sans recommendation. Now that I have some good feedback, I have added them as a retail source. They sell as little as a teaspoon.<br><br>http://www.ponddoc.com/Store/FishHealthProducts/fishhealth.html<br><br>and scroll down to Potassium Permanganate