4dkh Drop Checker DIY?

Discussion in 'General Planted Tank Discussions' started by GlenD, 14 Dec 2019.

  1. GlenD

    GlenD Member

    26 Jun 2019
    So I've run out of my drop checker solution.

    Is the below correct?

    1. Add 6g of sodium bicarbonate (NaHCO3) to 500ml RO = 500ml of 400dKH solution.
    2. Then dilute 5ml of 400dkh solution with 495ml H20 to get 500ml of 4dKH solution?
    3. Take 5ml of this into drop checker and add 5 drops of my AP PH test kit?
    1. is the above correct?
    2. if I wanted more than 5ml of the 4dkh solution in my drop check i.e. 5ml, would I need to add another 5 drops of the API PH tester?
    3. if you add more than 5 drops of the API PH tester will it give an incorrect reading or will it just make the colour darker?
  2. dw1305

    dw1305 Expert

    7 Apr 2008
    nr Bath
    Hi all,
    Yes, I think it is.
    You need "bromothymol blue" as the pH indicator. It is a narrow range pH indicator (colour change below)
    Just add enough bromothymol blue so you can see the colour change, it won't be very many drops.

    I just had a quick look (on a well known auction site) and a 35 mL bottle of bromothymol blue is £6.

    cheers Darrel
    GlenD likes this.

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