Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 9 of 9

Thread: Just got my TF-100! Results are in! HELP!!!

  1. Back To Top    #1

    Join Date
    Jan 2014
    Location
    The Woodlands, TX
    Posts
    64

    Just got my TF-100! Results are in! HELP!!!

    OK.....here we go. Time to get serious about keeping my pool in balance.

    IG 23,000 gallon pool. Manual chlorination (chlorinator with tabs). Reason I found this forum and bought my TF-100 was I can't keep chlorine in my pool, even with the chlorinator at it's highest level.

    From what I can tell, I've obviously got a CYA problem and high alkalinity. The high CYA level is causing my chlorine to be ineffective. Having a small yellow algae issue.....not too bad yet. Would appreciate suggestions on which to treat first. A general game plan.....reading all the sections of Pool School has helped. But, I just need help with the "next step" and what order to address them. THANKS!!!

    Test results:

    CYA = 90-100
    Calcium = 375
    FC = 3
    CC = .5
    Alkalinity = 150
    pH = 7.8

    Thanks,

    Brad
    Brad

    15,000 gallon IG plaster with attached spa. Full Pentair EasyTouch system. IC40 SWG. TFT-100

  2. Back To Top    #2
    Mod Squad YippeeSkippy's Avatar
    Join Date
    Jan 2012
    Location
    'burbs of Augusta, Georgia
    Posts
    6,461

    Re: Just got my TF-100! Results are in! HELP!!!

    You can confirm your CYA level by doing a 1:1 dilution- take 10 mL of pool water and combine it with 10 mL of tap water (which of course has *no* cya in it). Mix well. Then use this mixed water to perform the CYA test (filling the bottle to the bottom of the label and adding the reagent to the top, aprox 7mL each I believe?). Then you double whatever result you get. Your CYA might well be much higher than you realize and that is going to cause a huge conundrum if you need to SLAM your pool. If you're using tablets you're just complicating the issue because you're continuing to add more CYA (which is *also* in those chlorine tabs).
    A high CYA level requires a drain to become more manageable. Pool Math can help you determine how much might need draining, and it can be done in smaller partial drains. Then adding new CYA-free water gives you a pool which should be much easier to manage.
    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

  3. Back To Top    #3
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    9,198

    Re: Just got my TF-100! Results are in! HELP!!!

    Hi, welcome to TFP!
    First, stop using the tabs. They add CYA to your pool. You will need to drain and replace some of the water to bring the CYA level down between 30-50 ppm. Use PoolMath to determine how much to drain.

    After the CYA level is corrected you will need to complete the SLAM process to kill the algae. Check the pH and lower it to about 7.2 before starting the SLAM. You won't need to check pH again until the SLAM is completed.

    Keep reading pool school and ask any questions you may have.
    TFP Moderator
    Helpful links: TF Test Kits,TFP Pool School, PoolMath
    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
    Love TFP? Become a
    TFP Supporter!

  4. Back To Top    #4

    Join Date
    Jan 2014
    Location
    The Woodlands, TX
    Posts
    64

    Re: Just got my TF-100! Results are in! HELP!!!

    Quote Originally Posted by YippeeSkippy View Post
    You can confirm your CYA level by doing a 1:1 dilution- take 10 mL of pool water and combine it with 10 mL of tap water (which of course has *no* cya in it). Mix well. Then use this mixed water to perform the CYA test (filling the bottle to the bottom of the label and adding the reagent to the top, aprox 7mL each I believe?). Then you double whatever result you get. Your CYA might well be much higher than you realize and that is going to cause a huge conundrum if you need to SLAM your pool. If you're using tablets you're just complicating the issue because you're continuing to add more CYA (which is *also* in those chlorine tabs).
    A high CYA level requires a drain to become more manageable. Pool Math can help you determine how much might need draining, and it can be done in smaller partial drains. Then adding new CYA-free water gives you a pool which should be much easier to manage.
    Thanks!!

    Just did the diluted CYA test and came up with 55-60, which would put my CYA in the 100-120 range.

    So.......first step should be a drain (pool math shows about a 60% drain and refill) to get my CYA under control, then move on to the alkalinity and others?

    - - - Updated - - -

    Quote Originally Posted by zea3 View Post
    Hi, welcome to TFP!
    First, stop using the tabs. They add CYA to your pool. You will need to drain and replace some of the water to bring the CYA level down between 30-50 ppm. Use PoolMath to determine how much to drain.

    After the CYA level is corrected you will need to complete the SLAM process to kill the algae. Check the pH and lower it to about 7.2 before starting the SLAM. You won't need to check pH again until the SLAM is completed.

    Keep reading pool school and ask any questions you may have.
    Thanks!

    I travel a LOT for work....not being around for 4-5 days is a multi times a month occurrence.

    Can I keep my chlorine levels up with bleach if I'm not monitoring it every day or two? Was hoping to use the tabs for that.
    Brad

    15,000 gallon IG plaster with attached spa. Full Pentair EasyTouch system. IC40 SWG. TFT-100

  5. Back To Top    #5

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,077

    Re: Just got my TF-100! Results are in! HELP!!!

    If you use the tabs, your CYA will go right back up (1/3 of tabs is CYA) and your chlorine will be ineffective again. Liquid chlorine or bleach more than a day or so may prove troublesome.

    You can use the pucks and drain down each time your CYA gets over 60 or you can consider an SWG. Those are probably the two best solutions.

    PS - To be safe, drain roughly half of your pool, refill and then test for CYA again and then drain once more if necessary. If you continue to use pucks, I would suggest you drain enough to reduce your CYA to 40 ppm.....that'll give you some leeway before you get to 60.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  6. Back To Top    #6

    Join Date
    Jan 2014
    Location
    The Woodlands, TX
    Posts
    64

    Re: Just got my TF-100! Results are in! HELP!!!

    Quote Originally Posted by duraleigh View Post
    If you use the tabs, your CYA will go right back up (1/3 of tabs is CYA) and your chlorine will be ineffective again. Liquid chlorine or bleach more than a day or so may prove troublesome.

    You can use the pucks and drain down each time your CYA gets over 60 or you can consider an SWG. Those are probably the two best solutions.

    PS - To be safe, drain roughly half of your pool, refill and then test for CYA again and then drain once more if necessary. If you continue to use pucks, I would suggest you drain enough to reduce your CYA to 40 ppm.....that'll give you some leeway before you get to 60.

    Dave,

    Thanks for the insight.

    Just so I'm clear on your sentence above...."Liquid chlorine or bleach more than a day or so may prove troublesome."

    Are you saying, if I go more than a day or two without adding liquid chlorine or bleach, I will have trouble keeping up proper chlorine levels?
    Brad

    15,000 gallon IG plaster with attached spa. Full Pentair EasyTouch system. IC40 SWG. TFT-100

  7. Back To Top    #7

    Join Date
    Jan 2014
    Location
    The Woodlands, TX
    Posts
    64

    Re: Just got my TF-100! Results are in! HELP!!!

    After a 3/4 pool drain and refill, I just did a CYA test and I still seem awfully high for what I just went thru........

    In the 60-70 range if I'm doing the TF-100 test correctly? A couple questions on that....

    1. Shake the bottle. Wait at least 30s, then shake once more. Is that a good shake? As in, shake it up real good one more time? Or just a simple, single movement shake? Just wondering if I'm stirring things up too much with an aggressive shake?

    2. As I fill the view tube.....If I wait a few seconds after stopping the fill, the black circle returns to a slight view. (Things seem to settle?) Eventually, no matter how long I wait, there is no black circle. When is the proper level reached?

    Just making sure I'm doing this correctly. After spending one afternoon draining and over 1 day filling......just trying to avoid doing it again unless necessary.
    Brad

    15,000 gallon IG plaster with attached spa. Full Pentair EasyTouch system. IC40 SWG. TFT-100

  8. Back To Top    #8
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Just got my TF-100! Results are in! HELP!!!

    Quote Originally Posted by Flyguppy View Post
    After a 3/4 pool drain and refill, I just did a CYA test and I still seem awfully high for what I just went thru........

    In the 60-70 range if I'm doing the TF-100 test correctly? A couple questions on that....

    1. Shake the bottle. Wait at least 30s, then shake once more. Is that a good shake? As in, shake it up real good one more time? Or just a simple, single movement shake? Just wondering if I'm stirring things up too much with an aggressive shake?

    2. As I fill the view tube.....If I wait a few seconds after stopping the fill, the black circle returns to a slight view. (Things seem to settle?) Eventually, no matter how long I wait, there is no black circle. When is the proper level reached?

    Just making sure I'm doing this correctly. After spending one afternoon draining and over 1 day filling......just trying to avoid doing it again unless necessary.
    You want that stuff mixed well, so it reacts 100%. I use the speedstir to mix my CYA sample. You want cloudiness, that's what you're measuring: the cloudiness (turbidity is the technical term). Dribble the sample into the view tube and as soon as you can't see the black dot, see where that is. Then pour the sample back into the mixing bottle, give it another couple shakes, and repeat it until you get close results every time. At the beginning, it's not at all uncommon to need to take 10 readings to get three to agree! Maybe more.

    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!

  9. Back To Top    #9
    JesseWV's Avatar
    Join Date
    Apr 2011
    Location
    North Central WV
    Posts
    526

    Re: Just got my TF-100! Results are in! HELP!!!

    I just noticed that even though he says "with your back turned towards the sun," he is actually facing the wrong way toward the sun in the video!
    16k gal, 28'x3.5', Vinyl A/G, 1hp Pentair Dynamo 2-speed Pump, Hayward S160T Sand Filter, Intermatic HB800RCL Digital Timer, Intex 8110 SWG, TF-100 Test Kit, SpeedStir Author: Jesse's Graphical Pool Testing Log

Posting Permissions

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