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Thread: pH while slamming

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    Join Date
    May 2015
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    Warren, Ohio
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    pH while slamming

    I am in the process of slamming my pool for the first time. I'm working at keeping the FC at 16 right now ( based on a 43 CYA ) and I tested the pH just to see where it was at. It is well below 7.0 as it was a bright yellow. I had previously brought this up to 7.3 before beginning the slam. My question is if I should add some borax to correct the pH or what until the slam is complete? BTW the pool looks as if it is filled with blue milk.

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    Mod Squad YippeeSkippy's Avatar
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    Re: pH while slamming

    The pH test is not reliable when chlorine is above 10ppm. Around here the SLAM process advises you to get the pH in line first, because later you can't get a true reading.

    What are you using to SLAM with? Do you have a reputable test kit?
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
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    JasonLion's Avatar
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    Re: pH while slamming

    Welcome to TFP!

    The next time the FC level is below 10, test and adjust the PH back to the 7.2 to 7.4 range.

    What kind of chlorine are you using? The forms of chlorine that tend to lower the PH also tend to raise the CYA level very very quickly when used for slamming.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Azgirl71's Avatar
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    Re: pH while slamming

    Welcome to TFP. The others have guided you. I hope you enjoy it here.
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

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    Warren, Ohio
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    Re: pH while slamming

    I began with HTH liquid chlorine but after 12 gallons the FC never got above 6 ( starting at 1.1 according to the pool store ). I am guessing that the chlorine was old so I went to the local Sam's Club and got 8.25% Clorox and have used that since last night. The Clorox has allowed me to keep the FC above 13 by testing/adding every 2 hours.

    I'm using a Taylor K-2006 test kit.

    I'm also a bit confused about calculating water volume. My pool is 24' round AG with 54" walls but the water level is 48" deep. Which depth should I use to calculate volume from, 54" or 48"? I've seen folks in the forums use both numbers.

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    TFP Guide

    Azgirl71's Avatar
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    Re: pH while slamming

    For gallons use 24 round and use 48" since that is your water height.
    Lisa
    Intex AG vinyl 15' x 48" 4,300 gallons due to skimmer install, Krystal Clear SF pump combo 2800 GPH, Krystal Clear SWG, Pool Blaster Max vacuum, Hayward thru the wall skimmer, TF 100 test kit with speed stir, K 1766 Taylor salt test, My SLAM Process

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    Re: pH while slamming

    Thanks Lisa

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