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  1. #21
    Senior Member Rank = Hassai dc197's Avatar
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    Quote Originally Posted by john1 View Post
    What a great read Steve,20-40 ppm solution,what is that in other terms ie.. 0z per gal ?
    Don't worry about doing the conversion from mg/L to oz/gal yourself. Just let the mighty google do it:
    https://www.google.co.uk/webhp?sourc...FL+in+oz%2Fgal

  2. #22
    Extreme Koi Member Rank = Grand Champion Andre Asagi's Avatar
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    Quote Originally Posted by Trace View Post
    As above ..... for 50 litres ..... 1g of PP =20ppm

    so ... 120/50 = 2.4

    so ... 1g x 2.4 = 2.4g

    so ... 2.4g of PP in 120litres of water =20ppm

    I left plants in the same overnight (probably about 16 hours) a couple of days ago and they were ok (Elodea and Aquatic Mint).

    If there is any chance you are going to forget about it use 10ppm which would be 1.2g PP in 120 litres ...
    Ok.....So.....same situation but using 1000L container. So 20 grams of PP for 4 hours should do the business yeah?

  3. #23
    There's an easy peasy way to calculate doses of anything - just remember (or realise) that 1 mg of anything dissolved in 1 litre of water is 1 mg/L

    Once you suss that then everything just becomes simple arithmetic:-
    1 gram in 1,000 litres = 1 mg/L
    2 grams in 1,000litres = 2 mg/L and so on

    Or for smaller volumes just divide down so, if you want, say, 20 mg/L in 100 litres just scale it this way:-
    If 20 grams in 1,000 litres = 20 mg/L
    2 grams in 100 litres also = 20 mg/L

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  5. #24
    Banned Rank = Mature Champion Trace's Avatar
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    As Manky has said ... 20g in your 1000L is 20mg/L = 20ppm.

    I would leave it longer than 4 hours unless it's a really delicate plant.

    Must be big for such a large container .... what is it? ...

 

 
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