Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 13 of 13

Thread: Salt Test Result Inconsistencies

  1. Back To Top    #1

    Salt Test Result Inconsistencies

    I'm looking for some recommendations for which test result I should trust. Pool details are in my signature.

    Salt level per Hayward panel - 2500ppm
    Salt level per Taylor drop test - 4000ppm
    Salt level per Test strip - 2600ppm

    The pool is new and has been filled for 2 months where salt levels have decreased from 3200ppm to where it is above. No significant water replacement other than backwashing.

    My cell is reading low salt and I'm planning to add 30 lbs to bring it back up to ~3000ppm per pool math (11,500 gallon pool). I am a bit concerned that the drop test is so much different than the others?? I've tested salt weekly and its always significantly higher than the cell and strip reading.

    Should I proceed as planned or test salt another way?
    11,500 gallon mountain pond shaped vinyl line / Hayward 2spd pump / Hayward S244T sand filter (filled with zeobrite) / Hayward PL-P4 Automation panel / Hayward SWG (T-3 Cell) / Polaris 280 with booster / Hayward AquaConnect / Hayward CrystalLogic color changing LEDS

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Salt Test Result Inconsistencies

    Have you checked if the cell is scaled up and needs cleaning? That can cause a low salt reading. Usually the drop test is more accurate, but all tests are +/- 400ppm
    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!

  3. Back To Top    #3

    Re: Salt Test Result Inconsistencies

    Quote Originally Posted by jblizzle View Post
    Have you checked if the cell is scaled up and needs cleaning? That can cause a low salt reading. Usually the drop test is more accurate, but all tests are +/- 400ppm
    Haven't checked Jason...but 'assumed' it was fine as it has only been in use for 2 months. Could scaling build up that quickly?
    11,500 gallon mountain pond shaped vinyl line / Hayward 2spd pump / Hayward S244T sand filter (filled with zeobrite) / Hayward PL-P4 Automation panel / Hayward SWG (T-3 Cell) / Polaris 280 with booster / Hayward AquaConnect / Hayward CrystalLogic color changing LEDS

  4. Back To Top    #4
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Salt Test Result Inconsistencies

    It could build up in a few weeks depending on your chemistry.
    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!

  5. Back To Top    #5

    Re: Salt Test Result Inconsistencies

    Quote Originally Posted by jblizzle View Post
    It could build up in a few weeks depending on your chemistry.
    Gotcha - I'll check tonight for buildup. My numbers are as follows and have been for the past 6 weeks:

    FC ~4 ppm
    TA 50
    Ph 7.4
    CYA 25
    CH 75
    11,500 gallon mountain pond shaped vinyl line / Hayward 2spd pump / Hayward S244T sand filter (filled with zeobrite) / Hayward PL-P4 Automation panel / Hayward SWG (T-3 Cell) / Polaris 280 with booster / Hayward AquaConnect / Hayward CrystalLogic color changing LEDS

  6. Back To Top    #6
    Mod Squad YippeeSkippy's Avatar
    Join Date
    Jan 2012
    Location
    'burbs of Augusta, Georgia
    Posts
    6,482

    Re: Salt Test Result Inconsistencies

    Sidenote to your original question- I note that your CYA level is a skosh low for a SWG... Do you have goal levels in mind that you're striving for on all your levels?
    Each pool is different in its requirements and personality but there are suggested levels that you want to be aware of.

    In regards to your salt question- my attitude is "whatever makes the SWG happy" works for me. My Taylor 1776 test says one thing and the SWG says another <shrug>
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain

  7. Back To Top    #7

    Re: Salt Test Result Inconsistencies

    Quote Originally Posted by YippeeSkippy View Post
    Sidenote to your original question- I note that your CYA level is a skosh low for a SWG... Do you have goal levels in mind that you're striving for on all your levels?
    Great question and yes I do have a goal in mind. I've worked to get the FC level to stay stable at 4 ppm based on my pump run time. I didn't want to be experimenting with a higher CYA level and risk the FC dropping to an ineffective level based on a particular CYA level. My plan is to raise CYA to around 50 ppm later this week and then gradually lesson the pump run time while still keeping an adequate FC level.
    11,500 gallon mountain pond shaped vinyl line / Hayward 2spd pump / Hayward S244T sand filter (filled with zeobrite) / Hayward PL-P4 Automation panel / Hayward SWG (T-3 Cell) / Polaris 280 with booster / Hayward AquaConnect / Hayward CrystalLogic color changing LEDS

  8. Back To Top    #8
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Salt Test Result Inconsistencies

    We recommend even higher CYA levels for SWG pool ... up in the 70-80ppm range. If you have little sun, then 50ppm might be ok.
    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!

  9. Back To Top    #9

    Re: Salt Test Result Inconsistencies

    Checked the cell tonight and absolutely zero scale to be seen...maybe I'll take a water sample to the pool store just to see what they get for a salt reading.
    11,500 gallon mountain pond shaped vinyl line / Hayward 2spd pump / Hayward S244T sand filter (filled with zeobrite) / Hayward PL-P4 Automation panel / Hayward SWG (T-3 Cell) / Polaris 280 with booster / Hayward AquaConnect / Hayward CrystalLogic color changing LEDS

  10. Back To Top    #10

    Join Date
    Aug 2010
    Location
    Dallas, TX
    Posts
    4,052

    Re: Salt Test Result Inconsistencies

    I have found the Taylor drop test to be the most reliable.
    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
    If TFP has helped you, please click to SUPPORT TFP!

  11. Back To Top    #11

    Join Date
    Jun 2014
    Location
    Tucson, AZ
    Posts
    860

    Salt Test Result Inconsistencies

    I have a Pentair IC40 SWG and my unit consistently reads 400 to 500 ppm higher than my AquaChek test strips. Probably going to switch over to Taylor drops when I finish my strips just because I like titration/colorimetry methods better.

    I'm with YippeeSkippy on this issue, do whatever makes your SWG happy and just keep a record of SWG readings versus external method (strips or drops). Eventually you'll learn the "personality" of your SWG.



  12. Back To Top    #12

    Re: Salt Test Result Inconsistencies

    Bringing this back....mystery solved.

    Just last week, the cell reading went from 3200 to 2000 ppm in a few days. We also had 3-5" of rain during this same time so I wondered if the pool water got diluted. I tested the water via Taylor drop test (4000ppm) and aqua check strips (2650). These numbers were consistent with the results I had last earlier in July when adding 1 bag of salt made the cell happy, so I added 1 bag of salt.

    Unfortunately adding another bag did nothing to make the cell happy. It actually read lower once restarted. Taylor test results were 4400 ppm.

    Friday I called the pool store to make sure they could test the cell if I brought it in. Service manager (also co-owner) quizzed me as to why I needed to bring in a cell to be tested that was only ~3 moths old. Said I should be adding a bag of salt each month due to evaporation. I wanted to correct his logic around evaporation but it wasn't worth my energy.

    Yesterday I pulled the cell and road out to the pool store. Also took a water sample to see what their salt reading was. They had salt at 2900ppm.

    Cell tested bad and went home with a new one via warranty. Installed the cell and the instant salt reading was 4400ppm...which is exactly what the Taylor test indicated.

    Moral of story - always trust your own test results, pool store advice is worthless and just because a part is new doesn't mean it can't go bad. I honestly was making myself crazy questioning what I thought was correct so the cell being bad was awesome!!

    Questions;:
    - Is it common for these cells to just randomly die even when ran on a low percentage (35%)?
    - What are the negatives to having such a high salt content now (4400ppm)?
    11,500 gallon mountain pond shaped vinyl line / Hayward 2spd pump / Hayward S244T sand filter (filled with zeobrite) / Hayward PL-P4 Automation panel / Hayward SWG (T-3 Cell) / Polaris 280 with booster / Hayward AquaConnect / Hayward CrystalLogic color changing LEDS

  13. Back To Top    #13

    Join Date
    Jun 2014
    Location
    Tucson, AZ
    Posts
    860

    Re: Salt Test Result Inconsistencies

    Moral of story - always trust your own test results, pool store advice is worthless and just because a part is new doesn't mean it can't go bad. I honestly was making myself crazy questioning what I thought was correct so the cell being bad was awesome!!
    You got that right!!

    As for high salt, check your owners manual. I know that my Pentair will continue to operate and generate chlorine even if the high salt condition is on. The high salt means the water has higher electrical conductivity which would draw more current for a given voltage. However, I suspect the electrical circuit is designed to clamp the amount of current draw.

    I had high salt for a while but decided to drain off some water to lower it. It's up to you and what the manual says you should do.

Posting Permissions

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