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Thread: Acid use

  1. Back To Top    #1

    Join Date
    Mar 2008
    Location
    Florida
    Posts
    81

    Acid use

    I have had my pool a couple of years now, but I am still concerned with what I think is excessive acid usage. Every 3-4 days I need to add between 400-800ml of muriatic acid.
    My chems tonight are:

    Chlorine 2-4
    pH 7.8
    Total Alk 70
    Cal Hardness 300

    This is 4 days after I had the pool at 7.5pH, Chlorine at 10, Total alk at 80 with a cal hardness of 250 (I added some cal chloride to increase the hardness because the pool store kept giving me low readings) There has been no rain and I have lost about 1.25" due to evaporation, water temp 86-88 with ambient temps in the mid 90's

    I had figured that by now I wouldn't need to add so much...your thoughts?
    12-15k gallons capacity, 18'x34'
    2 main drains 4 returns 1 vacuum line
    pentair intelliflo 4x160 pump 200 sq ft media filter full width (~7' wide) swimout at deep end
    pebble sheen white diamonds

  2. Back To Top    #2

    Join Date
    Feb 2008
    Location
    Denton, TX
    Posts
    5,061

    Re: Acid use

    What test kit are you using?

    How old is your plaster?

  3. Back To Top    #3

    Join Date
    Mar 2008
    Location
    Florida
    Posts
    81

    Re: Acid use

    The plaster is actually 3 years and a month old. Time flies... The test kit is a Taylor K-1004.
    12-15k gallons capacity, 18'x34'
    2 main drains 4 returns 1 vacuum line
    pentair intelliflo 4x160 pump 200 sq ft media filter full width (~7' wide) swimout at deep end
    pebble sheen white diamonds

  4. Back To Top    #4

    Re: Acid use

    I find that at TA of 70 I actually get to *not* add acid every other day, so I am happy when my pool finally gets there. I know that in my case, it is because the tap water has a TA of 340 and so even a small topping off after evaporation adds to the TA level, which then makes the pH tend to rise rapidly.

    The pool store is giving you advice based on what you'd need if you used trichlor pucks for daily chlorine. In that case your TA of 70 would be low, but they don't understand that with bleach we don't need to have that large a buffer.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

  5. Back To Top    #5

    Join Date
    Mar 2008
    Location
    Florida
    Posts
    81

    Re: Acid use

    I try to keep my TA at 80, it fluctuates up or down roughly 10 ppm but no more than that. I should have mentioned that yes I use liquid chlorine. I only use pucks if I am away or when I need to increase CYA.
    12-15k gallons capacity, 18'x34'
    2 main drains 4 returns 1 vacuum line
    pentair intelliflo 4x160 pump 200 sq ft media filter full width (~7' wide) swimout at deep end
    pebble sheen white diamonds

  6. Back To Top    #6

    Join Date
    May 2010
    Location
    SW Georgia
    Posts
    298

    Re: Acid use

    I have to add acid quite regularly as well. I figured it was just the nature of the beast.
    FC 7.5
    CC 0
    PH 7.5
    CYA 45
    TA 70/80
    35K IG Vinyl 20 x 40 self built pool, Hayward Pro Series High-Rate Sand Filter 31" 98gal/min, Hayward TriStar 1.85hp, Hayward 400btu heater, BBB method w/Hypo, Jazz light w/matching fiber optic rope lighting around coping w/syncronized color wheels. Concrete Paver deck.

  7. Back To Top    #7
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
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    22,337

    Re: Acid use

    What happens if you don't adjust the pH when it gets to 7.8? does it stay there or does it keep going up?
    If it stays at 7.8 then I'd leave it there. There are a lot of pools that like 7.8 pH and rarely go above it, but as soon as you aadjust it down it goes right back to 7.8.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  8. Back To Top    #8

    Re: Acid use

    I need to check mine again tonight, I just added acid for the first time yesterday, heat wave has caused me to run my fountain all day. Prior to that, every time I checked it was always around 7.3-7.4.

    After the heat wave things will change back. My TA is a bit high, so this is a good chance to get that taken care of.

    This also reminds me, I need to test TA of my tap water.
    Aaron
    [ Vogue Vectra 24' AG | Hard plumb: Hayward Power-Flo Matrix 1HP 2-speed, 27" sand filter & Pentair MiniMax 100 NG | Taylor K-2006 | Central IL ]
    Powered by: TFP, PoolMath & TFTestkits

  9. Back To Top    #9

    Join Date
    Aug 2010
    Location
    Dallas, TX
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    4,052

    Re: Acid use

    Do you have any fountains, misters, anything like that?
    Built in 1957 44,000 gallon in-ground, Wet Edge Primera Stone in Sky Blue, Intelliflo VF Pump, 600 lb. Pentair Triton II TR-100 Sand Filter, CircuPool RG 60 Plus SWG, TF-100 test kit
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  10. Back To Top    #10

    Join Date
    Aug 2010
    Location
    Boston, MA
    Posts
    176

    Re: Acid use

    And just to make the point that it varies a lot between pools, my TA is 120 but it takes several weeks for the pH to go up from 7.2 to 7.8. So acid is more of a monthly thing for me. I count myself very lucky on that point.
    20k gallon IGP
    Plaster over gunite
    3/4 hp Hayward pump
    Purex Triton DE filter
    TF100 test kit w/ speedstir

  11. Back To Top    #11

    Join Date
    Mar 2008
    Location
    Florida
    Posts
    81

    Re: Acid use

    No fountains, misters etc. I have never left it alone at 7.8 or 8.2 pH because of warranty issues and bacterial-static nature of lower pH.
    12-15k gallons capacity, 18'x34'
    2 main drains 4 returns 1 vacuum line
    pentair intelliflo 4x160 pump 200 sq ft media filter full width (~7' wide) swimout at deep end
    pebble sheen white diamonds

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