Potassium
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Webmasters comment: Potassium Permanganate is used to kill parasites, sterilize bacteria, clean wounds and It will makes a pond nice and clean. You can buy  Potassium Permanganate (KMn04) at Home Depot stores or Publix (grocery store) that are in areas that use wells. It is used to clean iron filters. Large animal feed stores also might carry it. 
Have lots of hydrogen peroxide on hand to neutralize it and restore oxygen levels fast. Be careful. As the PP works it is using up oxygen that is why it is dangerous in water temps over 80 deg F where dissolved 02 is low. The hydrogen peroxide will quickly bring the oxygen level back up. I like to have lots of extra HP around more than once I took things too long and needed twice the amount to bring the 02 back up It is very easy to kill every fish in the pond over doing it. Be careful
You should see brown scum develop as it works this is the oxidized organic waste. Your filter will take that out, I like to do a good filter cleaning the next day.
You may see brown scum  hanging around. For me it is in my skimmers longest.
It is better to start slow take it easy and stay on your cycle. Use the two days off to clean your filter and do a water change then try again. Koivet says it may be the 5th treatment that really works.
Down here in Miami where temps are warm I will terminate the treatment before it turns amber because I can see the 02 level is getting low. Some say just 20 minutes is enough do not worry if you can't get 12 hours straight. In warm temps PP is hard on your fish.
I am happy with 6 two hour treatments in warm weather.
The first rule should be do no harm.
Have 6 quarts of hydrogen peroxide handy
Read the koivet article
Do the water changes
Have good water flow circulation and extra aeration.

Terry gave me a formula for calculating parts per million or ppm
mg/l is the same as ppm so we need to convert from metric. The formula is
Gallons X 0.0038 X ppm X % of purity = total grams
example, 1000 gallons = 3.8 grams for 1ppm or 7.6 grams for 2ppm etc.
This works with anything. 

It is real nice having a scale. Aquatic ecosystems sells them cheap. I like my electronic digital one for $100

 

Potassium & Peroxide Recipe

By: Doc Johnson

Ingredients:

· One pound of granular or crystalline potassium permanganate (KmnO4)

· One pond, freshly cleaned of debris, bottom-detritus, dead fish or uneaten food.

· One group of fish with flashing, red spots, spider web skin lesions, fin rot, sliminess, Ulcers, fungal lesions.

Precautions:

The presence of large amounts of organic debris, uneaten food, dead fish, leaves, dead plants will cause the potassium to spend it's energy on oxidizing the organics, not on the parasites or ulcers.

The presence of dechlorinator in the water will inactivate the treatment. (Latency 2 days)

The presence of Hydrogen peroxide will inactivate treatment. (Latency 3 days)

Potassium can kill a lot of algae, increasing oxygen demand, especially in warm water over eighty degrees.

How to do this:

Day One

1. Bypass filter but increase circulation and aeration.

2. Apply one level teaspoon of granular potassium permanganate per six hundred gallons of water. Do not stand down wind as the powder is added. Do not get in eyes. Do not get on skin. Do not breathe powder.

3. Wait until water changes from purple/pink into a brown or amber color.

4. Resume filtration and keep up all circulation.

5. Apply standard OTC Hydrogen Peroxide 3% USP at a rate of one quart per five thousand gallons of pond water. In one hour you'll have clear water with no residual evidence of Potassium staining.

Day Four

1. Bypass filter but increase circulation and aeration.

2. Apply one level teaspoon of granular potassium permanganate per six hundred gallons of water.

3. Wait until water changes from purple/pink into a brown or amber color.

4. Resume filtration and keep up all circulation.

5. Apply standard OTC Hydrogen Peroxide 3% USP at a rate of one quart per five thousand gallons. In one hour you'll have clear water with no residual evidence of Potassium staining.

Days Eight & Twelve

Exact repeat of Days one and four.

The importance of UV Sterilization in the limitation of bacterial infections cannot be over emphasized.

The importance of Ammonia and pH testing in the limitation of any disease cannot be over emphasized.

You can buy potassium permanganate at KoiStuff.

Additional Comments

"If you were going to use Potassium to combat a ciliated protozoan like Ich or something, you would have to hit the parasite every day for at least five days. There are much better ways to control these organisms." Doc Johnson