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  1. #1
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    Water filter man

    https://www.waterfilterman.co.uk/wat...705707313.html

    Bought this after looking round for a while and a good bit cheaper than others.
    It is the Hm model which I believe to be a lot better for £15.99 posted,will have to test it as per Mankys advice fo adding salt.
    They also have water purifiers and charcoal which Dtf uses,dont know if the price is right.

    Looked at the cheaper tds3 models but they didnt have a calibration screw,some had the hole but no screw inside,found this out after messaging the sellers.


    John

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  3. #2
    Senior Member Rank = Supreme Champion davethefish1's Avatar
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    Quote Originally Posted by john1 View Post
    https://www.waterfilterman.co.uk/wat...705707313.html

    Bought this after looking round for a while and a good bit cheaper than others.
    It is the Hm model which I believe to be a lot better for £15.99 posted,will have to test it as per Mankys advice fo adding salt.
    They also have water purifiers and charcoal which Dtf uses,dont know if the price is right.

    Looked at the cheaper tds3 models but they didnt have a calibration screw,some had the hole but no screw inside,found this out after messaging the sellers.
    thats a good price for the HM mate,
    my TDS meter doesn't have the calibration screw, though it would make adjusting much easier.

    but it can be calibrated by holding a combination of the various buttons down. just a bit more of a faff than the screw.

    i can't remember if i've used waterfilterman before but i get my cartridges from ROman in ireland, and 25kg sacks of activated, catalytic and bonechar carbon from coastal koi.
    and to be fair coastals carbons have lasted longer than any other i've used by far... 14 months unchanged and still going strong
    Last edited by davethefish1; 24-02-2024 at 10:35 AM.

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  5. #3
    I've used one of these since way before 2009. The first one lasted well over twelve years before it packed up in 2021 so I bought a replacement which is still working.

    They can't be recalibrated which isn't necessary because their accuracy doesn't drift with time but their accuracy can be checked with ordinary salt.

    To test the accuracy of a TDS meter you could either buy a TDS calibration solution or make your own with distilled water and table salt. The anti caking agents or iodine in salt won’t make any significant difference:

    1 gram of table salt dissolved in 1 litre of distilled water makes a TDS solution of 1,000 mg/L (ppm) which you can either use direct or you can dilute it down to more relevant koi pond TDS values using a syringe:

    10 ml of the 1,000 mg/L solution mixed with 10 ml of new distilled water makes a 500 mg/L solution.
    10 ml of that 500 mg/L solution with another 10 ml of new distilled water makes a 250 mg/L solution.

    There’s no need to buy 2 litres of water to make the standard in the first litre then have a second fresh litre available to dilute it down unless you want a very precise calibration solution. If you nick 10 ml out of the initial 1 litre of distilled water then add 1 gram of salt to the remaining 990 ml then use the 10ml you saved mixed with, say, 10 ml of the 1,000 (+ a gnats) solution you just made, the actual value of the final solution will be 525mg/L.

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  7. #4
    Extreme Koi Member Rank = Supreme Champion john1's Avatar
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    Quote Originally Posted by Manky Sanke View Post
    I've used one of these since way before 2009. The first one lasted well over twelve years before it packed up in 2021 so I bought a replacement which is still working.

    They can't be recalibrated which isn't necessary because their accuracy doesn't drift with time but their accuracy can be checked with ordinary salt.

    To test the accuracy of a TDS meter you could either buy a TDS calibration solution or make your own with distilled water and table salt. The anti caking agents or iodine in salt won’t make any significant difference:

    1 gram of table salt dissolved in 1 litre of distilled water makes a TDS solution of 1,000 mg/L (ppm) which you can either use direct or you can dilute it down to more relevant koi pond TDS values using a syringe:

    10 ml of the 1,000 mg/L solution mixed with 10 ml of new distilled water makes a 500 mg/L solution.
    10 ml of that 500 mg/L solution with another 10 ml of new distilled water makes a 250 mg/L solution.

    There’s no need to buy 2 litres of water to make the standard in the first litre then have a second fresh litre available to dilute it down unless you want a very precise calibration solution. If you nick 10 ml out of the initial 1 litre of distilled water then add 1 gram of salt to the remaining 990 ml then use the 10ml you saved mixed with, say, 10 ml of the 1,000 (+ a gnats) solution you just made, the actual value of the final solution will be 525mg/L.

    Manky you are a top man and very valuable on this forum.
    All you give is top class information and I thank you for that.

    I am not very good at this sort of tech but I think it has digested.
    Will be giving it a go very soon.
    John

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