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Thread: Inconsistent pH test results

  1. Back To Top    #1

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    Inconsistent pH test results

    Latest battery of tests reads as follows:

    FC: 5
    CC: 0
    pH: see below
    TA: 60
    CH: 350
    CYA: 50
    Borates: 50
    Salt: 800

    I just purchased the Taylor K-1285-6 pH test as my pH with the standard K-2006 kit reads over 8 regularly due to my spa spillover. The K-2006 appears to be accurate since when I put in the suggested amount of MA based on the acid demand test, the pH then reads at the expected level based on the MA added. Reagent was purchased last year and still looks fresh (I keep it in the house which is always air-conditioned). The new K-1285-6 test kit shows a pH of 7.4. I had my water tested at Pinch-a-Penny today for kicks and they stated 7.6 (surprisingly, all other pool store numbers were pretty close, except TA which I measured at 60. they gave me 120).

    I also purchased the K-1285-4 for when pH is very low, which happens when I overdose on MA sometimes. That kit goes to 7.4 on the high end and my pH on that scale is way darker than the 7.4 cell, so I presume that my pH is much higher.

    The Cresol Red reagent for the 1285-6 kit looks watery - it is an orangey-red and not as deep a color as the other indicator reagents. The Bromthymol Blue is deep as is the Phenol Red.

    The test kits were purchased from http://www.poolweb.com who had them drop shipped from Taylor, so you would assume they would be fresh from the manufacturer.

    Any suggestions as to what the problem is and why I am getting inconsistent results?

    Thanks!
    15x30 inground concrete pool w/spa and spillover, all under screen enclosure
    Hayward C1200 StarClear Plus Cartridge Filter and Hayward Navigator V-Flex
    Jandy AquaPure 1400, Laars LX400 propane heater w/120 gal above-ground tank
    Jandy VS FloPro 2.7 HP Pump VSFHP270JEP; FlowVis FV-C Flow Meter
    Jandy iAquaLink and OneTouch controller w/PDA remotes; JVA for draining pool

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    Mod Squad Bama Rambler's Avatar
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    Re: Inconsistent pH test results

    Sounds like a man with 2 (or in your case, 3) watches. I'd trust the one from the k-2006.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: Inconsistent pH test results

    Tell me about it, Dave! LOL

    My issue is that I want to know how far above 8 my pH is so I know if it is constantly increasing or settles in at one point. If it settles just above 8, I can leave it there and be happy. If it is constantly increasing, I have to address it.

    Hopefully someone has experience with this kit or can let me know what Cresol Red should look like. Maybe chemgeek can shed some light on the issue. Fingers are crossed I can solve this.
    15x30 inground concrete pool w/spa and spillover, all under screen enclosure
    Hayward C1200 StarClear Plus Cartridge Filter and Hayward Navigator V-Flex
    Jandy AquaPure 1400, Laars LX400 propane heater w/120 gal above-ground tank
    Jandy VS FloPro 2.7 HP Pump VSFHP270JEP; FlowVis FV-C Flow Meter
    Jandy iAquaLink and OneTouch controller w/PDA remotes; JVA for draining pool

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    Re: Inconsistent pH test results

    The K-1286-6 comparator block would have 7.4 look more yellow than pink. Is that what you are seeing? You should probably call Taylor tech support and ask them about what you are seeing. They don't indicate any potential interferences for cresol red, not even from chlorine.

    Note that phenol red goes from a red to a bright pink above a pH of 8.2.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  5. Back To Top    #5

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    Inconsistent pH test results

    My K-2006 shows a pH of over 8 with Phenol Red and a 44 mL sample as it turns deep red to hot pink. The K-1285-6 shows a deep yellow 7.4 with an 11.5 mL sample with Cresol Red. Will take pics of both when I get home. Thanks.

    My comment about the orangey-red was about the reagent itself in the bottle - it isn't a deep color like the other indicator reagents.

    15x30 inground concrete pool w/spa and spillover, all under screen enclosure
    Hayward C1200 StarClear Plus Cartridge Filter and Hayward Navigator V-Flex
    Jandy AquaPure 1400, Laars LX400 propane heater w/120 gal above-ground tank
    Jandy VS FloPro 2.7 HP Pump VSFHP270JEP; FlowVis FV-C Flow Meter
    Jandy iAquaLink and OneTouch controller w/PDA remotes; JVA for draining pool

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    Re: Inconsistent pH test results

    You should send your photos to Taylor and talk to them about it.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: Inconsistent pH test results

    OK, so I tried pH tests again and they seem to agree for the most part on 7.4/7.6. Here are the best images I could capture for comparison.





    I will see when pH gets high again what happens and keep the forum updated.

    Lastly, just want to be sure I am using the pipette properly. Below is the measure I am using for 0.5mL. Please confirm that is the correct way to fill the pipette for the stated measure.

    Thanks!

    15x30 inground concrete pool w/spa and spillover, all under screen enclosure
    Hayward C1200 StarClear Plus Cartridge Filter and Hayward Navigator V-Flex
    Jandy AquaPure 1400, Laars LX400 propane heater w/120 gal above-ground tank
    Jandy VS FloPro 2.7 HP Pump VSFHP270JEP; FlowVis FV-C Flow Meter
    Jandy iAquaLink and OneTouch controller w/PDA remotes; JVA for draining pool

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    JasonLion's Avatar
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    Re: Inconsistent pH test results

    Yes, you are using the pipette properly.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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