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Thread: Seeing big swings in TA and CH - New to this

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    Seeing big swings in TA and CH - New to this

    Ive been an uneducated pool owner for 7 years relying on the pool store for testing and chems. This all started when I was battling Mustard Algae/ Pollen (Still havent figured out which it was) either way I found this website and it set me on a new path with my pool. No more letting the pool store tell me what I need (since they have no clue what they are talking about half the time)

    I SLAMMED the pool from 2 PPM to 29 PPM with 3 Gallons of liquid chlorine one night. I had to test kit at the time but had one on order. So the next day I took a sample with me to the pool store. I was at 4/5 PPM chlorine. I still dont know if this was possible but had it checked twice. Perhaps that means there was something in there that the used all that chlorine that quickly? I also had .4 cc at this time. Now finally I am down to .1 cc and the I pass the overnight test.

    Now I am having an issue balancing. I had tested and seen my PH down to 7.0 so I added Calcium Carbonate per my new Taylor instructions. ( I hadnt read about the aeration technique yet but wish I had) Got the PH up to 7.7 as tested on 7.29 (next day after adding carbonate) here are the results

    FC= 2ppm
    cc = .1
    CYA = 40
    TA = 100
    CH = 180
    PH = 7.7

    THought I was good so just monitored chlorine for the next few days raising it to 5ppm each day. Then I tested 4 days later and had this

    FC= 3ppm
    TA = 170
    CH = 330 (tested twice)
    PH = 7.7

    So, can the the TA still be rising a week after I added the Carbonate? SHould I be concerned with the rising TA seeing as the PH seems stable and should I try to reduce it using acid or just keep testing to see if TA drops? And what would make the CH just spike like that?

    Also, I just read somewhere that liquid chlorine will raise your TA because of the lye in it. Is this true? I was under the impression that liquid was best because its only chlorine and wont increase CYA but I never read on here that it would increase the TA.
    24 Foot Above Ground
    4 feet deep
    1.5 HP Variable speed
    DE filter
    Taylor K-2006 - Liquid Chlorine Only

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    Mod Squad pooldv's Avatar
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    Re: Seeing big swings in TA and CH - New to this

    Welcome to TFP!

    FC
    Your FC is dropping too low for your CYA, FC/CYA Chart. Always keep FC above minimum to keep the pool sanitized and alhpgae free.

    TA
    Was fine at 100 and lower would be better, most folks find their PH is more stable when TA is 60-80. Adding acid to lower PH will also slowly lower TA over time. Or you can follow this, Pool School - Lower Total Alkalinity

    PH
    It is important to always maintain PH between 7.2 and 7.8

    Calcium carbonate raises CH, not lower PH

    Muriatic acid lowers PH

    No, bleach/liquid chlorine doesn't raise TA, baking soda raises TA.

    Here is a handy sheet on chemicals, what they do and how to add them to your pool, Pool School - Recommended Pool Chemicals

    Do some reading in Pool School
    ABCs of Pool Water Chemistry
    Pool School - Getting Started
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    Re: Seeing big swings in TA and CH - New to this

    Quote Originally Posted by pooldv View Post
    Welcome to TFP!

    FC
    Your FC is dropping too low for your CYA, FC/CYA Chart. Always keep FC above minimum to keep the pool sanitized and alhpgae free.

    TA
    Was fine at 100 and lower would be better, most folks find their PH is more stable when TA is 60-80. Adding acid to lower PH will also slowly lower TA over time. Or you can follow this, Pool School - Lower Total Alkalinity

    PH
    It is important to always maintain PH between 7.2 and 7.8

    Calcium carbonate raises CH, not lower PH

    Muriatic acid lowers PH

    No, bleach/liquid chlorine doesn't raise TA, baking soda raises TA.

    Here is a handy sheet on chemicals, what they do and how to add them to your pool, Pool School - Recommended Pool Chemicals

    Do some reading in Pool School
    ABCs of Pool Water Chemistry
    Pool School - Getting Started
    Thanks for the response. I did read Pool school. In fact ive read every sticky here several times. I know I need to add more chlorine essentially more than needed so it never drops below recommended however ive been testing to see how much increases by how many ppm as the Pool Calculator was close but not exact.

    To clarify I meant I added Sodium Carbonate NOT Calcium Carbonate to increase the PH. So my question is should I bother to Lower my TA if my PH is stable at 7.7?
    24 Foot Above Ground
    4 feet deep
    1.5 HP Variable speed
    DE filter
    Taylor K-2006 - Liquid Chlorine Only

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    Mod Squad pooldv's Avatar
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    Re: Seeing big swings in TA and CH - New to this

    Ok, that explains why your TA went up also. I doubt your PH will be stable,with TA at 170. But, if it is stable then that is ok.
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    Re: Seeing big swings in TA and CH - New to this

    OK thanks ill keep an eye on the PH for a few days if it starts going up ill throw acid in there and aerate.


    Any idea why the CH almost doubled in 4 days when all i added is Soda Ash and Chlorine?
    24 Foot Above Ground
    4 feet deep
    1.5 HP Variable speed
    DE filter
    Taylor K-2006 - Liquid Chlorine Only

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    Re: Seeing big swings in TA and CH - New to this

    Quote Originally Posted by glamaina View Post
    OK thanks ill keep an eye on the PH for a few days if it starts going up ill throw acid in there and aerate.


    Any idea why the CH almost doubled in 4 days when all i added is Soda Ash and Chlorine?
    No, it doesn't make sense to me- there was no Calcium in the chems you added. Could it be you made a mistake in your testing? CH doesn't jumps on its own, you need source of Calcium for that to happen.
    44k plaster pool, Pentair 011018 pump, DE6020 filter, LED lights, K2006 test kit

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    Mod Squad pooldv's Avatar
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    Re: Seeing big swings in TA and CH - New to this

    No, there is nothing that raises CH in a vinyl pool except calcium chloride. Maybe it was a testing error. Here is a more detailed explanation of the test,
    Pool School - Extended Test Kit Directions
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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