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Thread: Significantly different PH in deep end versus shallow end?

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    Significantly different PH in deep end versus shallow end?

    My pH readings are significantly different if I take them in the deep end versus the shallow end. In the shallow end near a jet I am getting readings of deep purple around 8 and at the deep end at around 7. I couldn't find any posts on this in any searches. Should I just assume I am in balance at around 7.5 or do I error to the readings in the deep end? This seems like a problem.
    30,000 Gallon Renovated Pool and Spa
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    reebok's Avatar
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    Re: Significantly different PH in deep end versus shallow end?

    sounds like really poor circulation. had the pump been running 30-60 mins when you did this? are you taking the samples 12-18" below surface? (about elbow deep should be good). what are your other numbers?
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    Re: Significantly different PH in deep end versus shallow end?

    Yes, pool has been running all day and always take the readings above the elbow deep. The deep end has worse circulation for sure as the spa waterfall really moves the water on the shallow end. I usually have the returns pointing upward to shoot across the water and push leaves toward the skimmer. Maybe I should point the returns more down towards the bottom?
    30,000 Gallon Renovated Pool and Spa
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    Re: Significantly different PH in deep end versus shallow end?

    you have a giant pool like that with no main drain in the deep end? pointing an eye down will help increase circulation down there. there is also a product called the circulator if the pros here think you have major issues with that kind of difference. maybe it would help.
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    Re: Significantly different PH in deep end versus shallow end?

    Yes, there is a drain down there but the water is definitely more still in the deep end as it looks to me like they should have put in an extra jet or two.
    30,000 Gallon Renovated Pool and Spa
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    Re: Significantly different PH in deep end versus shallow end?

    pH in a circulating pool should be very even and stay that way easily. I suspect some type of testing error. What are you testing with?
    Dave S.
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    Re: Significantly different PH in deep end versus shallow end?

    Could it be possible that the aeration from the waterfall elevates his Ph on that end? Granted the entire pool should have relatively the same Ph, but with the aeration only on one end it will take some time for the water to mix and equalize right?
    18,500 Gal. 27 ft AG Vinyl - Hayward Pump with Cooper 21" Sand Filter - GO VOLS!

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    Re: Significantly different PH in deep end versus shallow end?

    Quote Originally Posted by duraleigh
    pH in a circulating pool should be very even and stay that way easily. I suspect some type of testing error. What are you testing with?
    I second this!

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    Re: Significantly different PH in deep end versus shallow end?

    Quote Originally Posted by poolpop
    Could it be possible that the aeration from the waterfall elevates his Ph on that end? Granted the entire pool should have relatively the same Ph, but with the aeration only on one end it will take some time for the water to mix and equalize right?
    wrong ends. it should be opposite if that was happening cause aeration raises ph and his ph is high in the deep end, whereas the waterfall is in the shallow.
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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    Re: Significantly different PH in deep end versus shallow end?

    Deep end is around 7
    Shallow end is around 8

    Higher in shallow end.
    30,000 Gallon Renovated Pool and Spa
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    Re: Significantly different PH in deep end versus shallow end?

    Quote Originally Posted by duraleigh
    pH in a circulating pool should be very even and stay that way easily. I suspect some type of testing error. What are you testing with?
    I am taking multiple tests and using the FAS-DPD kit.
    30,000 Gallon Renovated Pool and Spa
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    Onyx Quartz Plaster
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    Polaris 280 Cleaner
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    Re: Significantly different PH in deep end versus shallow end?

    Try turning off the waterfall, with the filter still running see what the pH does after an hour. Then turn the fall back on, check it again after a couple hours. If you see it even out after the fall is off, and change again after it goes back on, then the fall is really raising the pH in the shallow end and you need to improve the circulation in the pool.
    --paulr
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    Re: Significantly different PH in deep end versus shallow end?

    Quote Originally Posted by brian7270
    Deep end is around 7
    Shallow end is around 8

    Higher in shallow end.
    stupid!
    my bad.
    16x32 21,000 gallon in-ground exposed aggregate, 1.5hp pump, 120 sqft catridge filter, birdcage, solar panels, aquavac tigershark qc robot.

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