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Thread: using fas-dpd for first time is this ok?

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    using fas-dpd for first time is this ok?

    Using the fas-dpd and CYA test from tftestkits and PH and Alk from another kit, I get:

    FC = 2.5
    CC = 0
    CYA = 45
    ALK = 90
    PH = 7.6 (non tftestkit, reading color chart it's 7.6 to 7.8 at the most).

    I could not get the full tftestkit right now so I bought the tests and used the instructions from their website. So once I got a FC of 2.5 (5 drops), I added 5 drops of R-0003 (swirling between drops) and there was no color change. So I take that to mean there are 0 CC's?
    24' x 52" AGP = 13.5k gallons
    Dynamo 2.0 HP pump,Sand Dollar sand filter
    Polaris 65 vacuum (good when there are a ton of leaves on bottom), Pool Rover Jr. (LOVE it, but power box dead right now), AquaCritter (an excellent suction side cleaner)

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    JasonLion's Avatar
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    Re: using fas-dpd for first time is this ok?

    Yes, that all sounds correct.

    With a CYA of 45 you want to maintain an FC level of at least 4 at all times.
    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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    Re: using fas-dpd for first time is this ok?

    To be 100% sure, I only need to shock if I ever get CC's?

    Or will I ever need to shock if CC=0?
    24' x 52" AGP = 13.5k gallons
    Dynamo 2.0 HP pump,Sand Dollar sand filter
    Polaris 65 vacuum (good when there are a ton of leaves on bottom), Pool Rover Jr. (LOVE it, but power box dead right now), AquaCritter (an excellent suction side cleaner)

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    Re: using fas-dpd for first time is this ok?

    You will only need to worry about shock if your water looks cloudy or measures .5ppm or more. With CC of 0 there is no need but to maintain proper chlorine level.
    27' round AG vinyl, 54" height with 18,200 gallons of water.
    1HP pump, 150lb sand filter run 12-14 per day. Using 12.5% liquid chlorine. BBB method.
    Taylor K-2006 test kit. Lamotte strips for borate at 50ppm.
    Goals: CYA-40, TA-80, FC-4, CC-0, Borate-50, PH-7.4-7.8 with use of fountain.

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    Re: using fas-dpd for first time is this ok?

    Ok, thanks for the replies.

    Just needing to make sure the pool is perfect for the weekend.

    If CC is 0 does that mean chlorine shouldn't fall at night?

    I know a check in the evening and the next morning is the way to check that, but just wanting to understand more of the background processes.
    24' x 52" AGP = 13.5k gallons
    Dynamo 2.0 HP pump,Sand Dollar sand filter
    Polaris 65 vacuum (good when there are a ton of leaves on bottom), Pool Rover Jr. (LOVE it, but power box dead right now), AquaCritter (an excellent suction side cleaner)

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    frustratedpoolmom's Avatar
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    Re: using fas-dpd for first time is this ok?

    No. A 0 CC reading is good but doesn't have any bearing on whether the chlorine will drop at night. Hopefully yours held?

    So you got 2.5, and you should have at least 4 at all times (as Jason advised). You should have added enough bleach to reach 6 or 7, which should keep you above 4 until the next night when you test again. Make sense?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

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    reebok's Avatar
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    Re: using fas-dpd for first time is this ok?

    you shouldn't lose more than 1ppm of fc overnight. have you read pool school? it will help you understand things as a whole a lot better.
    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: using fas-dpd for first time is this ok?

    yes I've read the pool school, but when you actually get your hands on something for the first time it still gets a little confusing. i've been testing since day one but not with fas-dpd so just a little different process than I been using.

    I didn't add any more bleach last night since it was dark, but this morning at around 7am it took 5 drops to turn clear so it held at 2.5 all night. I then bumped it up afterwards.

    Btw, will the amount of fas-dpd crystals affect the accuracy of the test? The instructions say a heaping scoop of crystals (using the blue scoop)... but a heaping scoop is not very precise. The scoop is so small it doesn't seem possible to have a rounded scoop full but a heaping pile that covers the flat area of the scoop too. So how 'off' will a test be if the 'heaping' scoop is a little more than intended?
    24' x 52" AGP = 13.5k gallons
    Dynamo 2.0 HP pump,Sand Dollar sand filter
    Polaris 65 vacuum (good when there are a ton of leaves on bottom), Pool Rover Jr. (LOVE it, but power box dead right now), AquaCritter (an excellent suction side cleaner)

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    Re: using fas-dpd for first time is this ok?

    Quote Originally Posted by rastoma
    yes I've read the pool school, but when you actually get your hands on something for the first time it still gets a little confusing. i've been testing since day one but not with fas-dpd so just a little different process than I been using.

    I didn't add any more bleach last night since it was dark, but this morning at around 7am it took 5 drops to turn clear so it held at 2.5 all night. I then bumped it up afterwards.

    Btw, will the amount of fas-dpd crystals affect the accuracy of the test? The instructions say a heaping scoop of crystals (using the blue scoop)... but a heaping scoop is not very precise. The scoop is so small it doesn't seem possible to have a rounded scoop full but a heaping pile that covers the flat area of the scoop too. So how 'off' will a test be if the 'heaping' scoop is a little more than intended?
    I believe as long as it turns red and stays red you are fine. I do not believe it has much effect as long as it is red.
    Kidney shaped ~ 10000 gallon Ig Plaster pool with pool cage. 120sf Cartridge filter. Pentair WhisperFlo WFDS-26, 230 Volt, 7.8/3.0 Amp, 1-1/2 Horsepower 2 speed pump, Solar panels on the roof. Heliotrope HelioMatic 4000D solar controller.

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    JasonLion's Avatar
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    Re: using fas-dpd for first time is this ok?

    mdhwoods is correct. Extra powder, within reason, is fine.
    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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