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Thread: Aeration to Lower CYA

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    Aeration to Lower CYA

    I have used too much di- & tri- chemicals and am afraid my CYA is going to be too high. I read a post on using aeration to lower CYA but have not been able to find it since. I have a 20K gal inground with a fountain running off 1/2" PVC from filter. I have three returns and can rig them to run as fountains if necessary. I have a f-100 test kit ordered and, at this time do not know, the concentration of CYA. Any help is appreciated.
    16' x 32' vinyl with 8' deep end, appx. 21K gals, 1 hp Water Ace pump, Hayward Vari Flow 75gpm sand filter, 3 returns, 2 skimmers, 2 main drains, Dirt Devil robotic cleaner.

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    Re: Aeration to Lower CYA

    Aeration lowes the total alkalinity, if you add muratic acid to lower PH. You have to drain water to lower cya.
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    Re: Aeration to Lower CYA

    PAgirl is right on about the cya, only way to lower it predictably is to do a drain/refill or pay for a reverse osmosis treatment (which is only available in a few places).

    I would wait to do much (other than maintain ph and a chlorine level) until your kit comes and you know your cya level. Then you can respond appropriately.

    How does your water look?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Aeration to Lower CYA

    Quote Originally Posted by PAGirl
    Aeration lowes the total alkalinity, if you add muratic acid to lower PH. You have to drain water to lower cya.
    To be absolutely correct. All aeration does is raise the pH. Adding acid is how you lower pH and TA together.

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    Jason, TFP Moderator
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    Re: Aeration to Lower CYA

    Wait until you get your test kit, but in the meanwhile consider your options for drain and refill vs RO. RO is not available in many areas. Are you on a well or on water restrictions in your area?
    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.

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    Re: Aeration to Lower CYA

    I'm on a well; and that's the problem. With the dry weather, I'm reluctant to try to pump that large amount of water.
    16' x 32' vinyl with 8' deep end, appx. 21K gals, 1 hp Water Ace pump, Hayward Vari Flow 75gpm sand filter, 3 returns, 2 skimmers, 2 main drains, Dirt Devil robotic cleaner.

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    Re: Aeration to Lower CYA

    Yeah, I understand your concern about the well and pump. How was your pool filled?

    Also, could please put your pool and equipments details in your sig...it will help us be more efficient.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Aeration to Lower CYA

    If you live someplace where you winterize the pool, you may find your CYA greatly reduced in the spring. I open to virtually 0ppm CYA every spring.
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    Raising pH after Lowering Total Alkalinity

    After two weeks, I have managed to get my total alkalinity down from over 200 to 100ppm. Now the pH is too low: around 6.8. Do I add baking soda to raise the pH; and, if so, will this also raise the alkalinity?
    16' x 32' vinyl with 8' deep end, appx. 21K gals, 1 hp Water Ace pump, Hayward Vari Flow 75gpm sand filter, 3 returns, 2 skimmers, 2 main drains, Dirt Devil robotic cleaner.

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    Re: Aeration to Lower CYA

    If you are reading 6.8 it is likely your ph is lower, since most tests that for anything there or lower. You need to get it up ASAP. Add enough Borax until your ph goes up to something measurable (maybe shoot for 7.2). It may take a couple of cycles of dosing up ph with borax circulating for 1 hour retesting and re-dosing. Borax will raise TA a little, so once you get a ph above 7.0, you could use aeration to raise it from there.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Aeration to Lower CYA

    I would suggest reviewing the article in Pool School about lowering your TA. You should not be adding so much acid at once, but should be focusing on the pH and making sure it does not get below 7. Then use aerating to raise the pH back up so you can add more acid.

    Now you may be so low you are damaging the equipment.

    Posted from my Droid with Tapatalk ... sorry if my response is short
    Jason, TFP Moderator
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    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Re: How much borax?

    My pool is 16 x 32 w/deep end; approximately 20,000 gallons. pH is very low. How much Borax at a time can I add to raise pH?
    16' x 32' vinyl with 8' deep end, appx. 21K gals, 1 hp Water Ace pump, Hayward Vari Flow 75gpm sand filter, 3 returns, 2 skimmers, 2 main drains, Dirt Devil robotic cleaner.

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    Re: Aeration to Lower CYA

    The Pool Calculator can help you determine that. Enter the info it asks for and it will tell you how much to add.
    26' X 52" Intex Ultra Frame. Intex Sand Filter
    26' X 52 Intex Ultra Frame Install
    You can lead a horse to (clear) water, but you can't force him to swim in it!

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    Re: Aeration to Lower CYA

    I'm getting confused. When I look at the Pool Calculator, it tells me that changing pH can change TA. If I try to raise pH, am I going to raise TA........I must be looking at something wrong! Seems like I'm adding something, then having to add something else to counteract that.
    16' x 32' vinyl with 8' deep end, appx. 21K gals, 1 hp Water Ace pump, Hayward Vari Flow 75gpm sand filter, 3 returns, 2 skimmers, 2 main drains, Dirt Devil robotic cleaner.

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    Re: Aeration to Lower CYA

    Did you read this section of pool school yet?

    pool-school/lowering%20total%20alkalinity
    26' X 52" Intex Ultra Frame. Intex Sand Filter
    26' X 52 Intex Ultra Frame Install
    You can lead a horse to (clear) water, but you can't force him to swim in it!

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    Re: Aeration to Lower CYA

    Low ph (or high ph) is worse than high TA for your pool. In your process of your lowering TA, i.e. adding acid after aeration, it looks like you added too much acid and lowered your ph too far. Basically, you need to get your ph back up in the an acceptable range (7.0-7.8) and work TA back down from there.

    What is your TA and ph this morning?

    Unfortunately, there is no good way to raise ph without raising TA a little. Borax does the lease to raise TA, but it still raises it.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Aeration to Lower CYA

    Thanks for quick reply; pH is showing 6.8 on test kit (that reading might be too high); TA is 100. I'm going to get Borax this morning. It's about a two hour round trip. I need to know what increments (#'s, ounces, etc.) to add the Borax. I appreciate it. I also have added a fountain from one of my three returns in an effort to aerate the water to raise the pH.

    Again, thanks
    16' x 32' vinyl with 8' deep end, appx. 21K gals, 1 hp Water Ace pump, Hayward Vari Flow 75gpm sand filter, 3 returns, 2 skimmers, 2 main drains, Dirt Devil robotic cleaner.

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    Re: Aeration to Lower CYA

    Since we don't know how low you are, I would probably pick up at least four boxes, so you don't have to make another trip.

    To avoid the trip, do you have?:
    Soda ash is available as ARM & HAMMERģ Super Washing Soda Detergent Booster. Do not confuse this with ARM & HAMMERģ laundry detergent! It is sold in the laundry detergent section of most larger grocery stores and some big box stores. It is also sold by pool stores under various names, including pH Increaser, pH Up, Balance Pak 200, etc. Soda ash is best added by pre-dissolving it in a bucket of water and then pouring that slowly in front of a return.
    It is not as ideal since it will raise TA more than Borax, but might save you the trip for now.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Aeration to Lower CYA

    I've added four pounds of Borax and still am getting a very low pH reading. I assume I continue adding Borax until pH is close to 7.5, then aerate to lower TA. If I add acid to lower the TA, I assume Iím just going to lower the pH as well. Will the acid just neutralize the Borax?

    Believe it or not, Iíve had this pool for twenty years and have never had a problem; Iíve used di- and tri- all this time. I winterize the pool every winter and, like John T (8/22/2012, 9:52), I assume my CYA has been low, I now figure, all this time because of the opaque winter cover that stays on from October to June. My water is clear right now (a 9 on a scale of 10) but the test kit readings are bewildering me. I have a TF-100 kit ordered and it should be here tomorrow. Right now, it seems like Iím just dumping chlorine, acid, and borax into a money pit. I appreciate all the advice!!
    16' x 32' vinyl with 8' deep end, appx. 21K gals, 1 hp Water Ace pump, Hayward Vari Flow 75gpm sand filter, 3 returns, 2 skimmers, 2 main drains, Dirt Devil robotic cleaner.

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    Mod Squad jblizzle's Avatar
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    Re: Aeration to Lower CYA

    as I said before, aeration does not lower TA it only raises pH.

    Read the lowering TA article in Pool School.

    Posted from my Droid with Tapatalk ... sorry if my response is short
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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