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Thread: Pool Chem levels

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    Pool Chem levels

    15k pool chlorine
    PH 7.5
    Calcium 325
    Alkalinity 60
    Cya 10-15 I filled the top of the test tube and i could barely see the dot
    FC 8


    Any reason to boost the cya levels?

    I have been adding 3 cups chlorine a day and 1/2 cup ph down a week
    Fresh Warer pool15k gallons
    Pentair Clean and Clear RP filter
    Pentair 320 chlorine filter
    1-1.5 Hp pump//TF-100 test kit

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    Mod Squad woodyp's Avatar
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    Re: Pool Chem levels

    Is this an indoor or totally covered/shaded pool? I'd have it at least 30 CYA so you can more accurately tell what you have.
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    Re: Pool Chem levels

    Quote Originally Posted by Fugazi View Post
    15k pool chlorine
    PH 7.5
    Calcium 325
    Alkalinity 60
    Cya 10-15 I filled the top of the test tube and i could barely see the dot
    FC 8


    Any reason to boost the cya levels?

    I have been adding 3 cups chlorine a day and 1/2 cup ph down a week
    Thats a pretty high FC level for next to nothing CYA.

    Dom
    Dom - TFP Guide
    Intex 18' X 48" Ultra Frame AGP 6700 gallons | Two Intex CS8110 SWG's | Hayward Pro Series 21" Sandfilter | Hayward 1.5HP Power Flo Matrix pump | Hayward Thru-wall Skimmer | Wanda the Whale | 72 sq ft of Sungrabber Solar Panels with Hayward GLC-2P-A | Taylor K2006 Test Kit, Sample Sizer & Speed Stir | Click Here To Become a TFP Supporter!

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    Re: Pool Chem levels

    Quote Originally Posted by domct203 View Post
    Thats a pretty high FC level for next to nothing CYA.

    Dom
    Yes I was keeping it on the top end of normal to ward off algae.

    I was going to bring it down to 5-6 since the cya level dropped from a previous level of 45.

    - - - Updated - - -

    Quote Originally Posted by woodyp View Post
    Is this an indoor or totally covered/shaded pool? I'd have it at least 30 CYA so you can more accurately tell what you have.
    It's an ourdoor pool that is shaded for half the day only until noon does the sun start to hit it.

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    Re: Pool Chem levels

    Was their a 'life event' that occurred to drop the CYA?
    Heavy rain and overflow, partial emptying of pool and refill?
    It is unusual for the CYA to swing that amount.
    Might want to retest that to confirm it before making other adjustment as the pool is acting like there is more CYA than the last test indicates.
    40k gal freeform, IG pebblesheen, 9'x'6' raised spa, 2-1/2 hp Whisperflo, 520 sq/ft cartridge, Legend w/ booster, Intellibrite 5g in pool @ spa, Rainbow 320 Chlorinator(retired),
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    Re: Pool Chem levels

    Quote Originally Posted by Fugazi View Post
    Yes I was keeping it on the top end of normal to ward off algae.

    I was going to bring it down to 5-6 since the cya level dropped from a previous level of 45.
    Even 5-6ppm with no CYA is harsh. If this was my pool I'd bump the CYA to 30-

    Is there visable algae in the pool?

    How often do you check FC?

    Dom
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    Re: Pool Chem levels

    Quote Originally Posted by ozdiver View Post
    Was their a 'life event' that occurred to drop the CYA?
    Heavy rain and overflow, partial emptying of pool and refill?
    It is unusual for the CYA to swing that amount.
    Might want to retest that to confirm it before making other adjustment as the pool is acting like there is more CYA than the last test indicates.

    We had two days of flooding rain and I had to drain my pool as it was almost overflowing.

    - - - Updated - - -

    Quote Originally Posted by domct203 View Post
    Even 5-6ppm with no CYA is harsh. If this was my pool I'd bump the CYA to 30-


    Is there visable algae in the pool?

    How often do you check FC?

    Dom
    Is there any reason to bump the cya tho? What reasoning is it to be high versus zero?
    There is some black spots what I assume is black algae other than that it's clear water.
    I check FC every weekend and and chlorine every day.

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    ozdiver's Avatar
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    Re: Pool Chem levels

    Ok, so that was the life event.

    Zero CYA means there is nothing 'holding' the FC in the water when the sun is beating on your pool.
    Up north they can stay on the low end of the CYA range but down south where we are, staying closer to the top prevents the 5-7 ppm FC drops during a sunny day.
    Even with 30 CYA my pool can lose 5 ppm on a sunny day.
    When I raised it to 50, I lose maybe 2ppm.

    So having enough CYA in your pool to prevent you falling below min FC during a day is a must.
    Any time you are below min FC, algae IS growing.
    Initially this will be noticed in a >0.5 CC
    That shows your FC is being consumed by something; either bather load or algae.
    40k gal freeform, IG pebblesheen, 9'x'6' raised spa, 2-1/2 hp Whisperflo, 520 sq/ft cartridge, Legend w/ booster, Intellibrite 5g in pool @ spa, Rainbow 320 Chlorinator(retired),
    Mastertemp 400k BTU, 3x3 hp Whisperflo Swimjets, 2x2 hp Whisperflow for 15ton moss rock waterfall, Intelitouch Controller, 850 sq/ft Travertine deck, Gas/Wood firepit,
    Autofill, TF-100 test kit w/ SpeedStir

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    Re: Pool Chem levels

    Not only does the CYA protect FC from UV, it also buffers the FC so it is not as harsh on your skin, hair, swimsuit, liner etc.

    You should either drop your FC levels to maintain 2-3ppm (which is hard to maintain in open sun) or raise your CYA.

    Why the hesitation to raise CYA?

    Dom
    Dom - TFP Guide
    Intex 18' X 48" Ultra Frame AGP 6700 gallons | Two Intex CS8110 SWG's | Hayward Pro Series 21" Sandfilter | Hayward 1.5HP Power Flo Matrix pump | Hayward Thru-wall Skimmer | Wanda the Whale | 72 sq ft of Sungrabber Solar Panels with Hayward GLC-2P-A | Taylor K2006 Test Kit, Sample Sizer & Speed Stir | Click Here To Become a TFP Supporter!

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