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Thread: ALK & HRD low, does it mater?

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    ALK & HRD low, does it mater?

    Using a HTH 6way test kit, here are the results.
    CL/BR 1/2
    PH 7.2
    ALK 30
    HRD 60
    CYA 30

    Looks like alk & hrd are low, how do I raise them up?
    I'm fixing to add salt and then get the saltwater system going, but trying to get all my numbers right first.
    18x48 Intex Ultra Frame, 6,423gal, 1500gph Cartridge, SWG, Setup June 2013.

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    UN1017's Avatar
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    Re: ALK & HRD low, does it mater?

    First off, you've got to get some bleach in there to get your FC up. For a CYA of 30, you never want it below 2. Also, you can ignore the Br portion of the test block. It only for Bromine (spas).

    You can take a little spin through Pool School to see what your levels should be and what chemicals to use.

    Also, be prepared to bump your CYA up once you fire up the SWG.
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    Chlorine/CYA Chart----Extended Test Kit Directions----SLAM

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    JasonLion's Avatar
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    Re: ALK & HRD low, does it mater?

    Hardness low is just fine in a vinyl liner pool, but alkalinity low should be adjusted up.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: ALK & HRD low, does it mater?

    Forgot to mention this was after having about 5 kids swimming for a couple hours, before they got in the FC was high from shocking it.

    Ok, so bleach, alk, and cya need to come up. If I add bleach will that raise any of the others? Thanks
    18x48 Intex Ultra Frame, 6,423gal, 1500gph Cartridge, SWG, Setup June 2013.

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    Richard320's Avatar
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    Re: ALK & HRD low, does it mater?

    Quote Originally Posted by Jeff405 View Post
    Forgot to mention this was after having about 5 kids swimming for a couple hours, before they got in the FC was high from shocking it.

    Ok, so bleach, alk, and cya need to come up. If I add bleach will that raise any of the others? Thanks
    No.

    Bleach raises FC
    Baking Soda raises Alkalinity
    Cyanuric Acid aka stabilizer raises CYA

    This article explains things in more depth, and also tells the proper way to add each
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