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Thread: Expected pH

  1. #1

    Expected pH

    Can anyone shed some light on this please


    My Tap water is pH 7.2
    Water from dechlorinator is pH 7.6


    Pond is constantly pH 7.9 with kh normally 3 or 4


    Would you expect pond water to be a lower pH ?


    Thanks guys



  2. #2
    Extreme Koi Member Rank = Supreme Champion Frimley Koi keeper's Avatar
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    I had something similar with my QT system. The day I put the fish in the pH was between 7.4 and 7.6 and stayed like that for a few days until I added a treatment then it went up to between 8.2 and 8.3. That was on the 19th of April and it's still sitting at between 8.2 and 8.3 even though the mains tap water is 7.3 and what comes out of the 3 Pod dechlorinator is between 7.4 and 7.6

    The treatments must have diluted out long before now unless it's the water conditioner I'm using when doing water changes that's lifting the pH? My KH is between 11 and 14

    My parameters are probably not that great due to the QT is still maturing as the Nitrite is being a bugger to shift at the moment but at least the Ammonia is back down to 0 as of a few days ago.
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    Moderator Rank = Supreme Champion Feline's Avatar
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    What is the pH of your tap water if it’s left overnight to gas off any dissolved CO2 that it came up from the underground pipes with?

    Its worth also leaving some dechlorinated water in an open container too for several hours to test it. This will give you your starting pH. If there are any algae or phytoplankton in the pond the pH will tend to be a little above this, generally higher in the afternoons if it’s sunny and your pond is outdoors.
    Last edited by Feline; 26-05-2021 at 03:51 PM.

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    OK so why would a 3 Pod dechlorinator be raising the pH of the water

    I'll give the test you suggested a try to see if it makes any difference to my water both from the tap and from the dechlorinator as I've been told we only have chlorine in our mains water not chloramine or is it chloramide?
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    All we ever wanted was everything,
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    Get up, eat jelly, sandwich bars and barbed wire,
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  7. #5
    The tap water was left for 10 hrs, no airstone were added
    the water was directly from dechlorinator. I didn’t leave that for several hours tbh

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    Moderator Rank = Supreme Champion Feline's Avatar
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    Quote Originally Posted by Frimley Koi keeper View Post
    OK so why would a 3 Pod dechlorinator be raising the pH of the water

    I'll give the test you suggested a try to see if it makes any difference to my water both from the tap and from the dechlorinator as I've been told we only have chlorine in our mains water not chloramine or is it chloramide?
    Removal of chlorine does slightly increase the pH, even if you leave out the dissolved CO2​ thingy

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    OK thanks

    The CO2 thingy? Is that the technical term
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    Quote Originally Posted by Feline View Post
    Removal of chlorine does slightly increase the pH, even if you leave out the dissolved CO2​ thingy
    What are you classing as slightly?

    When I tested in mid April the pH was between 7.4 and 7.6 in my QT system and when I tested the mains cold water on the 21st of May it was 7.3 on the 26th of May I tested what was coming out of the dechlorinator and the pH was between 7.4 and 7.6 so I guess you'd say a 0.3 rise is to be expected?

    The worrying thing is the pH in the tank jumped up from between 7.4 and 7.6 to 8.2 in about 2.5 days and since the start of May it's been holding 8.3
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  13. #9
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    Big jumps in short time periods are more likely to be due to photosynthesis of green things going on in the water and on walls etc. So long as you don’t have a lime leaching situation from mortar or slabs of course.

    People often think that there is a mahoosive difference between their tap water and their pond though simply because they test the tap water fresh out of the tap where it’s falsely low. If you think your canisters are changing the pH more than a little bit, it could be they are taking out something more than just a little bit of chlorine from the mains water?

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    It's a new GRP tank so no leaching cement unless the current building work has been shaking cement particles from the block work wall?
    ________________________________________________
    All we ever wanted was everything,
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    Get up, eat jelly, sandwich bars and barbed wire,
    Squash every week into a day.

 

 

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