Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 14 of 14

Thread: Not enough MA vs. pool calculator

  1. Back To Top    #1

    Not enough MA vs. pool calculator

    I have been adding the pool calculator's MA measurement to my pool; however, I never get the PH down to the desired level based on the amount it tells me to add. It seems I have to add double the MA to get the desired affect. I did check the bottles for the correct strenght and plugged it into the pool calc. With a large overflow waterfall from the spa into the pool and 2 scuppers, could this be the cause of my struggle? I tend to lose TA quickly as well. I run my pump from 9am - 9pm and brush exactly once a week. I am in Dallas, TX.

    I had this question on a calcuim topic and thought I should move it to it's own post. Any help is appreciataed. Here are my current levels.

    FC - 5
    CC - 0
    CYA - 40
    PH - 7.6
    TA - 70
    Caclium - 410
    28K River Sand Plaster Finish - 2.5 HP Stealth Pump - Jandy 60 Sq Ft DE Filter - LAARS LT400 Natural Heater - Polaris 280 - Jandy PDA PS6 Computer Center

  2. Back To Top    #2

    Re: Not enough MA vs. pool calculator

    Another question...how much MA can I add at a 1 time for a 28K gallon pool? When can i re-add? My builder always said 1 pint for every 10K to lower it .2. The pool calc is different.
    28K River Sand Plaster Finish - 2.5 HP Stealth Pump - Jandy 60 Sq Ft DE Filter - LAARS LT400 Natural Heater - Polaris 280 - Jandy PDA PS6 Computer Center

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: Not enough MA vs. pool calculator

    Depending on how long you wait between adding the muriatic acid and when you next test the PH, the PH might have gone down the correct amount and then have come back up before you had time to test it.

    Somewhat high TA plus aeration will raise the PH level. Adding acid to get the PH back in line will lower both PH and TA. The more aeration you have, the lower you need TA to be before things will stabilize. If you have a really large amount of aeration, it becomes quite difficult to get things stabilized.

    The first thing to try is to let the TA go down to 60 and see if PH will stabilize around 7.8, and see if that helps at all. The next thing to try would be to add borates to the pool and then let TA go down to 50 and then see if things will stabilize.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  4. Back To Top    #4
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    15,422

    Re: Not enough MA vs. pool calculator

    Maybe your pool is bigger than you think?
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  5. Back To Top    #5

    Re: Not enough MA vs. pool calculator

    Thanks for the tip. I was previously trying to keep TA at 90-100. Now I will make sure it is 60-70. Is it safe to add more than 1 round of MA to the pool in a day? If the builder was off on my pool size, do you have a way I can measure it?
    28K River Sand Plaster Finish - 2.5 HP Stealth Pump - Jandy 60 Sq Ft DE Filter - LAARS LT400 Natural Heater - Polaris 280 - Jandy PDA PS6 Computer Center

  6. Back To Top    #6
    Butterfly's Avatar
    Join Date
    May 2007
    Location
    South Carolina
    Posts
    10,045

    Re: Not enough MA vs. pool calculator

    Well, one gallon of bleach will raise 10,000 gallons of water approximately the percentage of the bleach in FC (i.e, one gallon of 6% ultra bleach will raise 10,000 gallons approx. 6 ppm FC).
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  7. Back To Top    #7
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: Not enough MA vs. pool calculator

    There are two ways to figure out the pool size. One is to measure the pool and do some calculating, the other is use chemical additions to adjust an initial size estimate over time. Start with some estimate of the pool size. Add whatever chemicals you need to add based on the Pool Calculators calculations and see if you are consistently getting higher or lower results than you anticipated. If the results are consistently higher than expected, lower your estimate of the pool size. If the results are consistently higher than expected, raise your estimated pool size.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  8. Back To Top    #8

    Re: Not enough MA vs. pool calculator

    According to my CYA, I need to have the FC from 3-7. So I put enough bleach to bring it to 5. I have noticed that every Friday it is back at 0. So is 1 week a normal time frame to lose all FC in Texas. It is in the 90s and my CYA=40, TA=60,ph 7.5.

    Also, I will try to re-calc my pool size using chemical analysis. Any other method you can recommend?
    28K River Sand Plaster Finish - 2.5 HP Stealth Pump - Jandy 60 Sq Ft DE Filter - LAARS LT400 Natural Heater - Polaris 280 - Jandy PDA PS6 Computer Center

  9. Back To Top    #9

    Join Date
    Oct 2007
    Location
    Valrico, FL
    Posts
    501

    Re: Not enough MA vs. pool calculator

    Richard (Chem_Geek) has stated that the pH calculations are inexact. On my pool I have found that I need 1.5 to 2 times the acid to achieve the desired pH change. However they are a good starting point.
    7,500 gal, IG pool, L shape 22' x 15', 1.5 hp pump, cartridge filter, AquaPlus SWG/Controller, Pebble-Tec liner.

  10. Back To Top    #10
    benavidescj's Avatar
    Join Date
    Apr 2010
    Location
    Fleming Island, FL
    Posts
    431

    Re: Not enough MA vs. pool calculator

    I have a similar issue. My pool is also 28k and has a waterfall that is about 8 ft across. My TA is around 70 and I constantly have to add MA, about 1 quart per day to keep the Ph down. JasonLion, I have borates (50 ppm) in the pool and was wondering how low the TA can go and what the side effects would be if it got lower?
    Carlos
    Pool: 28,000 gallons IG; IC 40 SWG; Pentair 120 gpm cartridge filter; Marble finish; Pentair Wisperflow 1.5 hp; Polaris 360
    Spa: 350 gallon; Bromine
    How to shock your pool

  11. Back To Top    #11

    Re: Not enough MA vs. pool calculator

    Thanks. What about my question regarding the FC going from 5 to 0 in 1 week. Is this normal?
    28K River Sand Plaster Finish - 2.5 HP Stealth Pump - Jandy 60 Sq Ft DE Filter - LAARS LT400 Natural Heater - Polaris 280 - Jandy PDA PS6 Computer Center

  12. Back To Top    #12
    Melt In The Sun's Avatar
    Join Date
    Oct 2009
    Location
    Tucson, AZ
    Posts
    3,897

    Re: Not enough MA vs. pool calculator

    modog, yes that is normal. Most pools lose 2-3 ppm/day. You'll need to add chlorine more than once a week!
    11,200 gal, Pebble-Tec; Tristar 2-speed 1hp - Swimclear 325 ft2 cart - SWG - A & A in-floor cleaner - Heat pump. For the poolside cooking, a Yoder Wichita and a Big Steel Keg!
    TF Test Kits -- PoolMath -- Pool School
    Make each day your masterpiece. - John Wooden

  13. Back To Top    #13
    svenpup's Avatar
    Join Date
    Nov 2009
    Location
    Sacramento, CA
    Posts
    820

    Re: Not enough MA vs. pool calculator

    Quote Originally Posted by modog
    Thanks. What about my question regarding the FC going from 5 to 0 in 1 week. Is this normal?
    You should measure pH and chlorine daily and adjust as needed. You should never let your FC go to 0 (or below the minimum level for your CYA for that matter).

    ..and yes, losing 5ppm FC in a week is normal, especially in the Texas sun.
    TFP Method Advanced Intermediate
    • 17,500 gallons - In Ground - Plaster - Hayward Swimclear 3020 Cartridge Filter - Sta-Rite Max-E-Glas Main Pump upgraded with A.O. Smith B2980 E-Plus New Centurion Two-Speed Motor - Polaris 280 Cleaner with Polaris PB4-60 Booster Pump - TightWatt2 Timer - Taylor K-2006 Test Kit - Pool Pilot Digital Nano SWCG

    Helpful Links: Pool School, BBB for Beginners, How to Shock (hint...it's a process not a product), Chlorine/CYA Chart, Jason's Pool Calculator

  14. Back To Top    #14

    Re: Not enough MA vs. pool calculator

    Thanks for the info.
    28K River Sand Plaster Finish - 2.5 HP Stealth Pump - Jandy 60 Sq Ft DE Filter - LAARS LT400 Natural Heater - Polaris 280 - Jandy PDA PS6 Computer Center

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •