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  1. #1
    Extreme Koi Member Rank = Rokusai TAC's Avatar
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    Hydra chloramine T dosage

    Chloramine-T (n-chloro-para-toluene sulfonamide sodium salt) has traditionally been used to treat external bacterial infections. It has also been reported to be effective for the treatment of monogenean trematodes (skin and gill flukes); it also means that high doses may be toxic to koi. Chloramine-T functions by slowly breaking down to hypochlorous acid , with the release of oxygen and chlorine. The active ingredient is p-toluene sulfonamide. Sunlight hastens the breakdown, therefore ponds should not be treated in bright sunlight, and the powder should be stored in the dark. Toxicity, as well as effective dose, is dependent upon water hardness, pH and temperature.
    In the hard, high pH water of my area, I found the following recommended doses to be effective and safe even to small koi. CT is also safe to be use with Salt at any temperature (my pond with 3ppt of salt content).
    For Moderately hard water PH around 7-8 use 15ppm
    For Hard water PH 8-8.5 use 20ppm
    Here the formula to prepare for your CT treatment dosages
    Example: 1000 gallons with PH 7.5 require 15ppm
    1000 gallons = 3785 liters
    15ppm means 15mg per liter
    So a 1000 gallons pond with PH 7.5 you will need 3785 L x 15 mg = 56,775 mg/L or 57 grams.
    So a 1000 gallons pond with PH 8.5 you will need 3785 L x 20 mg = 75,700 mg/L or 76 grams.

    Is this right seems 76 grams per 1000 gallon is very high
    I know Kusuri recommend chloramine dosage at 15g to 25g per 1000 gallons.

    Help please need to use this weekend



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  3. #2
    You use the value 1,000 gallons = 3,785 litres but there are 3,785 litres in 1,000 US gallons and 4,546 litres in an Imperial gallon so you should first establish whether the formula you quote is for US or Imperial gallons.

    With these types of calculations, since you are trying to achieve particular values of mg/L, I always recommend calculating exclusively in metric units instead of converting back and forth.

    Forget ppm and use the modern unit mg/L which is the same and much easier to understand when you are dealing with grams (or milligrams) and litres then try it this way:

    1 milligram of something added to 1 litre of water is 1 mg/L
    Therefore 1 gram in 1,000 litres is also 1 mg/L
    Then it becomes simple:
    15 milligrams in 1 litre is 15 mg/L
    Therefore 15 grams in 1,000 litres is also 15 mg/L

    That couldn't be more easy peasy, all you have to do is confine ppm to the dustbin of history and to know the volume of your pond in litres. Then you will never again have to worry about whether what you are reading refers to US gallons or Imperial.
    Last edited by Manky Sanke; 30-04-2016 at 07:02 PM.

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  5. #3
    Extreme Koi Member Rank = Rokusai TAC's Avatar
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    Thanks Manky Sanke

    Yes the above conversion was US.

    I'm so old school I only understand gallons and ounces although grams are possible as they are on the scales

    So based on 5 thousand gallons a PH of 8 would 6 ounces or 150 grams be right or could I go higher.

  6. #4
    What you are trying to do when adding a treatment is achieve a dose concentration in milligrams per litre which is exactly the same as grams per 1,000 litres so, as I explained, it's far easier to work directly with your pond volume in litres. That way the result is precise and safer because you don't have to worry about remembering, or searching on line for, the correct conversion and scaling up or down from grams per gallon, also which gallon that might be.

    A 5,000 (Imperial) gallon pond contains 22,730 litres and you could round that up to 23,000 litres for convenience and to allow for the water in the pipework.

    So, in a 23,000 litre pond, if you want a concentration of 15 mg/L then:

    15 mg/L is 15 grams per 1,000 litres or 15 x 23 grams in 23,000 litres
    15 x 23 = 345 grams

    Or, if you want to use a pond volume of 22,730 litres:`
    15 x 22.730 = 341 grams

    BUT, those values are very high for chloramine T and are more in line with a sterilising dose.


    I don't know where you got your dosages from but there is some very muddle headed advice on the Internet so you should double check that you really want to achieve 15 mg/L and especially the accuracy of the dosages you quoted in your first post.

    I would guess that you, or your information source, have confused 15 mg/L with 15 grams per 1,000 (Imperial?) gallons and you really should be trying to achieve 1.5 mg/L which is more reasonable as an anti-bacterial dose and one tenth of the dosages calculated above. A dose of 3.0 mg/L would be more in line with killing parasites.

    Working in litres (or thousands of litres) is far safer and would avoid the five to ten times overdose from the figures you have been given.

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  8. #5
    Extreme Koi Member Rank = Rokusai TAC's Avatar
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    Eureka I've got it you're the man Manky.

    Saturday I put in 200 grams then on Monday 150 grams all fish look ok feeding well.

    I shall now leave further treatment till Saturday I will then dose at 3.0 mg/L for four days.

    3 mg/L is 3 grams per 1,000 litres or 3 x 23 grams in 23,000 liters 3 x 23 = 69 grams

    Thanks again for your help

  9. #6
    Easier innit?

    That there foreign Metric System is perfect working out dosages and concentrations but I'm still drinking me beer in pints - rule Britannia

    UK-Union-Flag.png

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