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Thread: Help with measuring chlorine when high

  1. Back To Top    #1

    Join Date
    Jul 2016
    Location
    Mount Kisco, NY
    Posts
    5

    Help with measuring chlorine when high

    Hi - I am new to the whole pool thing and have an algae issue, I tested my water and found CYA to be above 100, so decided to do a partial drain (3 times) as I was nervous about liner. My new results are as follows:

    CYA - 65
    FC - 3.0
    CC - 0.5
    Ph 7.4
    TA - 90
    CH - 130

    based on my 20,000 gallon pool - I figure I need to raise chlorine to 26ppm to shock - which I have done (I used 6 gallons of 8.25% bleach). My question is - how is best way to check chlorine levels? It seems it would need 52 drops of the reagent to test!!

    Thanks for any insight!

    Drew
    20,000 Gallons, In-Ground, Vinyl

  2. Back To Top    #2

    Join Date
    Jan 2014
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    Buckeye AZ
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    807

    Re: Help with measuring chlorine when high

    It is why slamming with high CYA is a PITA. Get the 2 oz bottle of the 0871. It's like $11.
    There is a 5 mL version of the FC test, one drop = 1 ppm, but the accuracy is lower. If going that route, you'd probably want 30 FC as your target to account for the lower accuracy.

    Then use the 10 mL test for the OCLT.
    10,500 gal IG, Topaz Pebble, auto-level
    Hayward DE filter, 2HP Ecostar VSP, ProLogic PS-4, GVA actuators
    Cal Pools Wave Force Plus (wall return jets plus 2 floor pop-ups), Venturi Skimmer
    Water sheer, 2 wok pots, bubbler stem on the baja step
    ColorLogic Mutlicolor LED lamp. Taylor 2006+speed stir

  3. Back To Top    #3

    Join Date
    Jul 2016
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    Mount Kisco, NY
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    Re: Help with measuring chlorine when high

    Thanks - that helps! I wanted to get CYA lower - but was tired of continuously draining the water. The pool is only into its second season - but I was using the chlorine tablets....until I found this site and starting getting educated!
    20,000 Gallons, In-Ground, Vinyl

  4. Back To Top    #4

    Join Date
    Jan 2014
    Location
    Buckeye AZ
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    807

    Re: Help with measuring chlorine when high

    whoops.
    10,500 gal IG, Topaz Pebble, auto-level
    Hayward DE filter, 2HP Ecostar VSP, ProLogic PS-4, GVA actuators
    Cal Pools Wave Force Plus (wall return jets plus 2 floor pop-ups), Venturi Skimmer
    Water sheer, 2 wok pots, bubbler stem on the baja step
    ColorLogic Mutlicolor LED lamp. Taylor 2006+speed stir

  5. Back To Top    #5

    Join Date
    Jul 2016
    Location
    Mount Kisco, NY
    Posts
    5

    Re: Help with measuring chlorine when high

    One more question - pool is already much better and water is just a little "hazy"...but very blue and I can clearly see the bottom again. When I have to pass the 3 tests - does "clear water" mean crystal clear? I plan to do the OCLT tonight. The CC has never been above 0.5 since I started this, which I thought was odd.
    20,000 Gallons, In-Ground, Vinyl

  6. Back To Top    #6

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    Mr Bruce's Avatar
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    Mar 2014
    Location
    Greenville, SC
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    1,798

    Re: Help with measuring chlorine when high

    Yep, crystal clear. You'll hear people use references like a) tell is a quarter is heads or tails in the deep end or b) tell if the screws on the drain are philips or flat head.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

  7. Back To Top    #7

    Join Date
    Jul 2016
    Location
    Mount Kisco, NY
    Posts
    5

    Re: Help with measuring chlorine when high

    Ok - Thanks!
    20,000 Gallons, In-Ground, Vinyl

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