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Why does my pH change so much in the resiviour but not run off

Discussion in 'Hydroponics / Aeroponics' started by rookanga, Mar 14, 2017.

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    rookanga

    rookanga Member

    Drip system in coco/perlite

    Last night I set the pH to 5.8 (didn't have enough to to make sure it stays that way...) came back 20 hours later, the pH is 6.2 (I was collecting it in a bucket) but in the resiviour it's 7.1. Why did it change so much in the resiviour then in the run off. All I have is the pump and a recirculating system in there. Can anyone explain this?
     
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    Son of a collier

    Son of a collier Active Member

    hi dude your coco buffers ph to a certain extent, so hence the ph of the run off being different to your tank.
    the temp of the liquid you are testing can affect your readings, did you leave the run off sitting in the bucket maybe evaporation has changed the ph.
    i shouldn't worry too much as long as your plants look well
     

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