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Thread: ph Question

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    ph Question

    When I check my FC, it is the same anywhere in the pool I test. My ph ranges from 7.2-8.0 depending on where in the pool I take it. In both cases I use a water sample 18" from the surface.
    Is this usual?
    35,000 Gal. - 40x20x8 - Plaster - SWG Pentair IC 60 - Barracuda G3 Vacuum - Hayward c1750 Cartridge Filter - Blue Torrent VS 1.5hp pump - Pool is 45 years old.

    "I'd build a deck over my pool if I didn't have a SWG"

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    Re: ph Question

    Is this usual?
    Absolutely not. If the water is circulating correctly in your pool, ALL chemistry should be almost identical regardless from where you take the sample.
    Dave S.
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    Re: ph Question

    Make sure your washing out the tube well each time. Slowly, painfully slowly, one drop at a time with bottle fully upright.

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    Re: ph Question

    I just needed to add 2 gal of chlorine to my pool and then checked the ph. It looks like it went way off the chart high 8+. Is that normal?
    35,000 Gal. - 40x20x8 - Plaster - SWG Pentair IC 60 - Barracuda G3 Vacuum - Hayward c1750 Cartridge Filter - Blue Torrent VS 1.5hp pump - Pool is 45 years old.

    "I'd build a deck over my pool if I didn't have a SWG"

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    Re: ph Question

    Ph rise right after dosing of chlorine is normal. It will come back down. Did you establish what your correct ph was?

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    Re: ph Question

    I'm going to double rinse the testing tube each time. Maybe that was causing different readings. I got 8.0 in 2 locations and 7.0 in 2 locations.
    35,000 Gal. - 40x20x8 - Plaster - SWG Pentair IC 60 - Barracuda G3 Vacuum - Hayward c1750 Cartridge Filter - Blue Torrent VS 1.5hp pump - Pool is 45 years old.

    "I'd build a deck over my pool if I didn't have a SWG"

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    Re: ph Question

    I rinse first with tap, (often swishing with my finger along the sides), rinse again with tap, then rinse with pool water, then test.

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    Re: ph Question

    How many returns do you have in the pool? I see its 45 years old. It's probably got dead spots n perhaps the reason why you're getting conflicting results.

    If you haven't already, Pool School is full of educational literature to help you understand your pool, chemistry and equipment.
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    Re: ph Question

    If you do post more ph readings that are that far apart, it might help to describe locations of readings, specifically distance between the most disparate readings, proximity to pool returns, if pump is running and proximity in time to any addition of pool chems. But as per earlier posts, hard to fathom how there could be such a wide disparity in ph levels.
    Pool: 13k gal. in-ground; Stonescape Mini Pebble - Tropics Blue; Connected Spa - dual spill-over; Aqua Rite T-15 SWCG; AquaLogic PS-4 Automation; Sta-Rite DE Filter; Sta-Rite Max-e-Therm 400k BTU pool heater; Intellifo 2-VST Pump; Stenner 45mp2(25psi/10gpd) acid injection; Bulbwizard color LED pool lights; Poolvergnuegen 2 wheel side suction cleaner; FAFCO rooftop solar. TF-100 w/ speed stir.

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    Update

    A couple of weeks ago I posted that I was confused about why my ph got different readings (7.8+7.2) at different spots in the pool.
    Turns out that the readings were low near the return jet area and high in a area furthest away.
    35,000 Gal. - 40x20x8 - Plaster - SWG Pentair IC 60 - Barracuda G3 Vacuum - Hayward c1750 Cartridge Filter - Blue Torrent VS 1.5hp pump - Pool is 45 years old.

    "I'd build a deck over my pool if I didn't have a SWG"

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    Re: Update

    Philo-

    Could you put this post with your original so it will all tie together? I have an old brain, LOL, and it always needs refreshing!

    - - - Updated - - -

    I'm glad you figured out your issue, though!


    Threads merged by mods...
    Marla
    No longer living vicariously through other people's pool builds. Pool build is complete on my IG SWCG pool, approx 10,000 gallons. All Jandy equipment - VS 1.5 hp pump, 580 cartridge filter, AquaPure 1400 salt cell, AquaLink PDA system. Dolphin m500. PebbleSheen Blue Surf with shells and beads added. TF-100 w/ SpeedStir. A Houston Pool Build Inside the Loop

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    Re: Update

    How are you chlorinating the pool. Any use of trichlor tablets in a feeder?
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Re: ph Question

    Good question JV, I was thinking that or pH Automation. Do let us know Philo, this is highly unusual, so there must be something causing it.
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    Re: ph Question

    No tablets, no ph automation. Just 2.5 gallons of chlorine once a week .
    Doesn't aeration raise ph?
    35,000 Gal. - 40x20x8 - Plaster - SWG Pentair IC 60 - Barracuda G3 Vacuum - Hayward c1750 Cartridge Filter - Blue Torrent VS 1.5hp pump - Pool is 45 years old.

    "I'd build a deck over my pool if I didn't have a SWG"

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    Mod Squad pooldv's Avatar
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    Re: ph Question

    Yes, aeration raises PH.
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    Re: ph Question

    Then there is no reason to get varying pH reading like that.
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    Mod Squad JVTrain's Avatar
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    Re: ph Question

    If there is no use of trichlor tablets or other chemical introduction, I can't come up with a reasoning for this lower pH near returns versus other areas of the pool. Unless when you're testing each location, you happen to be using different backgrounds behind the color match test, skewing the results in one location versus the other.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

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