Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 17 of 17

Thread: Taking over saltwater pool...test results

  1. Back To Top    #1

    Join Date
    May 2014
    Location
    Houston
    Posts
    24

    Taking over saltwater pool...test results

    Evening all,

    Quick background bought a home with a saltwater pool. Don't trust the pool service companies and want to take care of maintenance myself. Actually they included a free month of pool service and my numbers don't match the tag they leave on the door. Something tells me they skip out to save some money. Got my TF100 kit here are the results.

    pH: purple as can be 8.0+
    FC= 1
    CC= .5
    TC=1.5

    CH=300
    TA=240
    CYA=??? Did this test twice, could always see the black dot at the bottom of the view tube. Not exactly sure what I am supposed to see, looks like I was just adding water. Some help here?

    Overall pool appearance is great, water is clear. Minor hardwater type scaling on tiles and rockwork. Cleaned some of it off with a pool stone...not sure if thats the best way.

    All advice welcome!!

    Thanks-Robert

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Taking over saltwater pool...test results

    Start by lowering the PH to around 7.2.

    That CYA result means your CYA level is zero. For a SWG we recommend CYA around 70 to 80. However, don't go all that way in one go. Raise CYA to perhaps 50, give it time to settle, then test again in a week and adjust from there.

    Longer term you need to get that TA level down some. Does your fill water have high TA?
    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

  3. Back To Top    #3

    Join Date
    May 2014
    Location
    Houston
    Posts
    24

    Re: Taking over saltwater pool...test results

    I assume that the fill water does have high TA, how would I know for sure? Test it?

    Alright will work on lowering PH..I know to add acid, is there a particular type that should be used over the other dry vs muriatic ect?

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Taking over saltwater pool...test results

    Yes, test both TA and CH for your fill water.

    Muriatic acid is a little more difficult to handle, but worth the extra effort when you are using a lot. It is both less expensive and doesn't add anything to the pool you don't want. Dry acid adds sulfates, which is fine at low or medium levels, but can be a problem if it gets really high.
    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

  5. Back To Top    #5

    Join Date
    May 2014
    Location
    Houston
    Posts
    24

    Re: Taking over saltwater pool...test results

    What happens if the fill water is high? I do have some brown/rust appearance near the port where the fill water enters the pool. The pool is a plaster type pebbletec type finish. Figured I would get the pool under control before trying to address that issue.

  6. Back To Top    #6

    Join Date
    May 2014
    Location
    Houston
    Posts
    24

    Re: Taking over saltwater pool...test results

    Now that I think about it, how is it possible for me to still maintain a FC of 1 with 0 CYA?? My SWG is set to about 90% FWIW.

  7. Back To Top    #7

    Join Date
    May 2014
    Location
    Current: Singapore Previous: Clayton, Victoria, Australia
    Posts
    584

    Re: Taking over saltwater pool...test results

    It is possible for you to maintain FC 1 with 0 CYA because your SWG is producing chlorine (technically Sodium Hypochlorite and Hypochlorous acid) from the salt (Sodium Chloride) and water.
    Increasing CYA will allow you to dial down the SWG, reducing wear on the plates.

  8. Back To Top    #8

    Join Date
    May 2014
    Location
    Houston
    Posts
    24

    Re: Taking over saltwater pool...test results

    Been adding Acid and CYA past couple of days.

    FC=11
    CC=0
    CH=250
    TA=190
    CYA=30
    Ph=7.5

    Going to add some more acid and CYA today. 4lbs of CYA raised from 0=30 so I have an additional 4lbs. Would I be correct in assuming that my FC jumped way up due to the fact that I previously had 0 CYA and my SWG was set to 90%? Now that we have a little stabilizer seems I need to turn it down or OFF for a day or so correct?

  9. Back To Top    #9
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Taking over saltwater pool...test results

    Quote Originally Posted by jqsquared View Post
    Been adding Acid and CYA past couple of days.

    FC=11
    CC=0
    CH=250
    TA=190
    CYA=30
    Ph=7.5

    Going to add some more acid and CYA today. 4lbs of CYA raised from 0=30 so I have an additional 4lbs. Would I be correct in assuming that my FC jumped way up due to the fact that I previously had 0 CYA and my SWG was set to 90%? Now that we have a little stabilizer seems I need to turn it down or OFF for a day or so correct?
    Yes. You've stopped losing so much to the sun and the SWG is finally catching up.
    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!

  10. Back To Top    #10

    Join Date
    May 2014
    Location
    Houston
    Posts
    24

    Re: Taking over saltwater pool...test results

    Should I be worried about the 11 TC? Safe to swim?

    Guessing I should target 70-80 CYA with a TC of 3?

  11. Back To Top    #11
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Taking over saltwater pool...test results

    Quote Originally Posted by jqsquared View Post
    Should I be worried about the 11 TC? Safe to swim?

    Guessing I should target 70-80 CYA with a TC of 3?
    It's fine. Shock level for 30 CYA is 12 FC and you're below that.

    I would raise CYA and follow the FC/CYA chart.
    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!

  12. Back To Top    #12

    Join Date
    May 2014
    Location
    Houston
    Posts
    24

    Re: Taking over saltwater pool...test results

    Thanks all.

    So while I am trying to get everything in line, is it necessarily a bad thing that my FC is higher than CYA? It will probably take some time to get the SWG dialed in.

  13. Back To Top    #13
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Taking over saltwater pool...test results

    Quote Originally Posted by jqsquared View Post
    Thanks all.

    So while I am trying to get everything in line, is it necessarily a bad thing that my FC is higher than CYA? It will probably take some time to get the SWG dialed in.
    Nope. As long as you are below shock level, you don't need to worry and can swim.
    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!

  14. Back To Top    #14

    Join Date
    May 2014
    Location
    Houston
    Posts
    24

    Re: Taking over saltwater pool...test results

    turned the SWG down from 90% to 20% today since the FC was still at 11. Had it turned off yesterday. Got a blinking "check cell" light. Anyone have any experience with this? I have records that show the cell was cleaned in May and in good condition. Could the adjustment of the pool cause this?

  15. Back To Top    #15

    Join Date
    May 2014
    Location
    Houston
    Posts
    24

    Re: Taking over saltwater pool...test results

    Alright read that the SWG has a light that comes on every 500 hours @ 8hours a day that would make sense. Will need to check it and reset the light this weekend.

    Here are my current numbers:

    FC=10
    CC=0
    CH=275
    TA=130
    CYA=60
    pH=7.2

    Where to go from here?

  16. Back To Top    #16
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Taking over saltwater pool...test results

    Quote Originally Posted by jqsquared View Post
    Alright read that the SWG has a light that comes on every 500 hours @ 8hours a day that would make sense. Will need to check it and reset the light this weekend.

    Here are my current numbers:

    FC=10
    CC=0
    CH=275
    TA=130
    CYA=60
    pH=7.2

    Where to go from here?
    Swimming
    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!

  17. Back To Top    #17

    Join Date
    May 2014
    Location
    Houston
    Posts
    24

    Re: Taking over saltwater pool...test results

    Quick update: Everything seems to be holding steady, here in Houston its hot, having to add acid every couple of days.

    FC=6.5
    CC=0
    CH=275
    TA=80
    CYA=50
    pH=7.4

    Current concern is that the water feels different than before I added CYA, raised FC and lowered pH. Its "rougher" feeling on our skin, more dried out feeling. Also fingers get "pruney" not sure if I noticed that before, or took much longer. Is this caused by the CYA, higher FC, or lower pH? Would adding borates solve this?

Posting Permissions

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