Become a TFP Supporter Pool Math Forum Rules Pool School
Page 1 of 2 12 LastLast
Results 1 to 20 of 24

Thread: First real test results re: water balance

  1. Back To Top    #1

    Join Date
    Jul 2014
    Location
    St. Simons Island, GA
    Posts
    170

    First real test results re: water balance

    I just received the Taylor k-2006 test kit for a 12,500 gallon above ground, vinyl pool with SWG generator. Water is clear and beautiful. Not burning my eyes anymore. Test was performed at 9 AM when the SWG had been off for 16 hours. I'm concerned about water balance at the moment, not chlorine.

    pH 7.6
    Calcium hardness 120 ppm
    total alkalinity 130 ppm
    CYA 32
    FC 1.5
    combined chlorine 0 (but I used the smaller sample amount instead of the larger, more accurate amount & am not concerned about chlorine just now)

    According to the test kit wheel, the saturation index is -0.1.

    According to test kit booklet, I'm thinking I need to add a gallon of muriatic acid to bring total alkalinity down to about 80.

    The booklet says 120 ppm calcium hardness is low, but TFP recommends 0-300 for a vinyl pool, so there's a conflict between the two recommendations.

    I'll have to go purchase more CYA as I'm out. I am, however, surprised it is so low since I originally put in more than was called for but that was 4 weeks ago.

    What's your opinion on these first test results?
    Home pool: Intex 11,400 gallon AG vinyl pool with sand filter & SWG. Taylor K-2006 test kit - coastal Georgia. I'm also in charge of the Elk's Lodge Pool, which is 55,000 gallons in-ground concrete with sand filter, 2 HP Hayward pump, currently using tri-chlor pucks and cal-hypo system.

  2. Back To Top    #2

    Join Date
    May 2014
    Location
    Ft. Wright, KY
    Posts
    44

    Re: First real test results re: water balance

    You have a vinyl pool, so you can safely ignore CH. It is only a problem with vinyl if it's way too high.

    I think you can ignore TA unless it's causing problems with wild swings in pH (your pH as it stands is fine). This is certainly one of the last things to be worried about.

    Your CYA is low for a SWG, but you know that already.

    I've also heard others say that the smaller sample size for chlorine is plenty accurate. I always use the smaller sample.

    I hope you mean you're not worried about the FC because you're already addressing that, because I sure would be worried about FC at 1.5.

    I also ignore the test booklet and use Pool Math instead. Have you discovered that gem yet? If not, check it out. Really easy to use.
    24K gallon IG gunite (built 1976), plaster (Diamond Brite) redone (poorly) 2012
    Hayward EC65A DE filter Taylor K2006-C test kit
    Ft. Wright, KY (Cincinnati area)

    Don't argue. Just get the kit. TF100 or Taylor K2006C

  3. Back To Top    #3
    GreatCanadian's Avatar
    Join Date
    Jul 2011
    Location
    St. John's, Newfoundland
    Posts
    844

    Re: First real test results re: water balance

    Well my first opinion is that you SHOULD be worried about your chlorine level right now. It's 1.5. That's too low. Why not bring it up to avoid possibility of an algae bloom.

    Your TA is a little high, but I wouldn't worry too much about that unless the pH rises. If it does, lower it with acid, and that will lower TA as well. If it rises again, lower it, and eventually your TA will find the sweet spot. If you choose to lower the TA with acid you will be lowering your pH as well. You could bring pH down to 7.3 or thereabouts, but don't bring your TA right down to 80 now, as you pH will be far too low.

    Yes, your CYA needs to be increased. Try a target of 70 first. Don't target 80 as you might overshoot.

    I think your calcium hardness is fine where it is, but others here with more knowledge may have a better opinion.

    EDIT: I see Smeade beat me to it.
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

  4. Back To Top    #4
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: First real test results re: water balance

    What he said ^^

    Don't add a gallon of acid to lower TA. It will drop your pH too low. Check out Effects of Adding Chemicals down near the bottom of poolmath. You won't damage plaster, but you might damage the pump and you can say hello to burning eyes again.

    How many times did you test the CYA? Even after several years practice, I pour it back and forth again and again until I'm sure of what I'm seeing. Being off 10 or 15 is normal, but if you targeted 70 and you're reading near 30, something is going on there. Could be test error, could be some bad CYA from China, and the liquid stuff doesn't seem to give the results it should, based on reports this year.
    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
    Smykowski's Avatar
    Join Date
    Sep 2011
    Location
    Gurnee, IL (North Suburban Chi-town)
    Posts
    3,065

    Re: First real test results re: water balance

    What he said^^^

    pH is fine. CH is fine. TA is fine. Worry about FC. It is he most important thing in your pool.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

  6. Back To Top    #6

    Join Date
    Jul 2014
    Location
    St. Simons Island, GA
    Posts
    170

    Re: First real test results re: water balance

    Thank you for the replies. Since the water is clear and beautiful, I really didn't want to be making any big adjustments, especially since I was worried about changing the pH too much by adding acid.

    What I meant by not being worried about chlorine at the moment is two fold: 1) I was more interested in water balance, and 2) this morning before some regular maintenance, the skimmer was clogged, so the pump wasn't doing much and there was white crust all over the SWG electrolytic cell, so I figured the chlorine would be low. Now that it's running normally again, I'll test for chlorine when I get home after it's been running all day and get truer results.

    PS- the SWG has been in use for about a month now. Is that a normal time frame for the electrolytic cell to get completely covered in a white crusty paste? (It came right off with just a garden hose.)

    PPS - I tested CYA only once. It seemed like an easy and straightforward test, but I'll do it again before I add more CYA just to be safe.
    Home pool: Intex 11,400 gallon AG vinyl pool with sand filter & SWG. Taylor K-2006 test kit - coastal Georgia. I'm also in charge of the Elk's Lodge Pool, which is 55,000 gallons in-ground concrete with sand filter, 2 HP Hayward pump, currently using tri-chlor pucks and cal-hypo system.

  7. Back To Top    #7



    Join Date
    Jul 2012
    Location
    Whidbey Island, WA
    Posts
    392

    Re: First real test results re: water balance

    Quote Originally Posted by Richard320 View Post
    What he said ^^

    I pour it back and forth again and again until I'm sure of what I'm seeing. Being off 10 or 15 is normal
    Also profound advice. I will do same. Thank you.
    IG under fir trees and one cherry surrounded by grass built in 1979, 30k, plaster, old Sta-Rite HRPB30, 4.9 sq.ft, 20 GPM/sq.ft., but with new glass, new (in 2012) 1 HP WhisperFlo one speed, new (in 2013) Rainbow tab chlorinator attached at the top, old Maxi-Flo Heat Exchanger MF-260, Burnham V7 oil heater 245 MBH, new (in 2012) Compool to Easytouch, Taylor K-2005 and TF-100.

  8. Back To Top    #8

    Join Date
    Jul 2014
    Location
    St. Simons Island, GA
    Posts
    170

    Re: First real test results re: water balance

    I got home. Added CYA and an extra strong koi pond pump to circulate water much faster. Let it run for about an hour and then brushed CYA around until it was no longer visible on bottom of pool. Test results now are:

    FC still 1.5
    TA still 130
    pH down to 7.5 (from 7.6)
    cc still 0
    CYA up to 50-ish.
    did not test for calcium hardness.

    So, I added a wee bit more CYA (I do not have a reliable method of weighing such small amounts) and a gallon of bleach. Will leave regular pump and extra koi pond pump running overnight as I realize that CYA takes time to dissolve fully.

    PS- I did not buy the AquaChem brand of CYA on shelves at Lowe's, Home Depot & Wal-Mart as it said "made in China." I bought the My Salt Pool brand off the shelf at Wal-Mart b/c it said "made in USA."
    Home pool: Intex 11,400 gallon AG vinyl pool with sand filter & SWG. Taylor K-2006 test kit - coastal Georgia. I'm also in charge of the Elk's Lodge Pool, which is 55,000 gallons in-ground concrete with sand filter, 2 HP Hayward pump, currently using tri-chlor pucks and cal-hypo system.

  9. Back To Top    #9
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    First real test results re: water balance

    Your CYA addition can take up to a week to fully register on a test ! Let's hope you didn't over shoot.
    I would not recommend broadcasting it into the pool. You should put the CYA in a sock or knee high and put it in the skimmer basket if you have one. If you don't have a skimmer hang it in front of the return. Pump should be running the whole time until it is dissolved with either method. 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  10. Back To Top    #10

    Join Date
    Jul 2014
    Location
    St. Simons Island, GA
    Posts
    170

    Re: First real test results re: water balance

    This morning CYA is around 56-ish, FC at 3 and cc is less than .5. That's after adding CYA and 1 gallon bleach, then letting pool pump, plus an extra strong koi pond pump, circulate water for 12 hours. Wish I'd measured FC before I went to bed.
    Home pool: Intex 11,400 gallon AG vinyl pool with sand filter & SWG. Taylor K-2006 test kit - coastal Georgia. I'm also in charge of the Elk's Lodge Pool, which is 55,000 gallons in-ground concrete with sand filter, 2 HP Hayward pump, currently using tri-chlor pucks and cal-hypo system.

  11. Back To Top    #11

    Join Date
    Jul 2014
    Location
    St. Simons Island, GA
    Posts
    170

    Re: First real test results re: water balance

    According to Pool Math, the addition of a gallon of bleach yesterday evening should have raised FC well above 3. Because FC was at 3 this morning, I am going to assume that a lot more than just 1 ppm got consumed overnight. Plus, both my wife and I thought the water looked clearer this morning and the paper filter was brown even though it was white after being cleaned yesterday.

    Therefore, I conclude I must have algae. I added another gallon of bleach just now (it's all I had on hand), will let SWG run on "boost" all day. I'll buy lots of bleach today and make a decision whether to SLAM the pool when I get home and test it again to see where CYA and FC levels are.

    Recommendations?
    Home pool: Intex 11,400 gallon AG vinyl pool with sand filter & SWG. Taylor K-2006 test kit - coastal Georgia. I'm also in charge of the Elk's Lodge Pool, which is 55,000 gallons in-ground concrete with sand filter, 2 HP Hayward pump, currently using tri-chlor pucks and cal-hypo system.

  12. Back To Top    #12
    GreatCanadian's Avatar
    Join Date
    Jul 2011
    Location
    St. John's, Newfoundland
    Posts
    844

    Re: First real test results re: water balance

    I believe your CL level was too low for too long. I think you're getting caught up in TA and pH and CYA, and less concerned about the most important one - chlorine. In a couple of posts above you stated (in 2 separate posts) that CL was 1.5, but you were worried about the CYA level. You MUST keep your chlorine level up, first and foremost. Then you can focus on your other levels. Yes, you have algae in my opinion. Do NOT add any more CYA because you are probably going to have to SLAM. Also, as someone else already stated, your CYA may not show up on a test for a week. So try to add up what you've added and use pool math to determine your current CYA level. And then refer to the CYA chart to see what your CL level needs to be.
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

  13. Back To Top    #13

    Join Date
    Jul 2014
    Location
    St. Simons Island, GA
    Posts
    170

    Re: First real test results re: water balance

    SURPRISE! I expected my FC to be the same as this morning when I got home and tested it, b/c I figured between the sun and whatever is in my pool (algae?) the gallon of bleach I put in this morning would have been consumed. I just tested it .... twice .... and it came back at 9.5 and 10! Now I am wondering whether I need to SLAM it. (I bought lots of bleach today in anticipation of slamming tonight.)

    Should I or shouldn't I?
    Home pool: Intex 11,400 gallon AG vinyl pool with sand filter & SWG. Taylor K-2006 test kit - coastal Georgia. I'm also in charge of the Elk's Lodge Pool, which is 55,000 gallons in-ground concrete with sand filter, 2 HP Hayward pump, currently using tri-chlor pucks and cal-hypo system.

  14. Back To Top    #14

    Re: First real test results re: water balance

    I would bring it up to SLAM level, and run the OCLT tonight. That will tell you whether you need to keep going with the SLAM in the morning.
    Outdoor 14,000 gallon IG plaster pool built in 2000 with spillover spa, 2 hp WhisperFlo pump with MagneTek motor, Sta-Rite cartridge pool filter with 300 ft2 filtration area and 0.33 gpm/ft2 filtration rate, Aquabot Rapids 4WD robotic pool cleaner, Raypak digital gas heater, and Intermatic mechanical timer located in the Dallas-Fort Worth metroplex

  15. Back To Top    #15

    Join Date
    Jul 2014
    Location
    St. Simons Island, GA
    Posts
    170

    Re: First real test results re: water balance

    Danacc, done. Actually overdone. I reckon that extra gallon of 3% bleach "just to make sure" overshot the mark of 28. At 7:10 PM, FC is 30. Been about 45 minutes or so since added the bleach. SWG is off. Pumps are on.
    Home pool: Intex 11,400 gallon AG vinyl pool with sand filter & SWG. Taylor K-2006 test kit - coastal Georgia. I'm also in charge of the Elk's Lodge Pool, which is 55,000 gallons in-ground concrete with sand filter, 2 HP Hayward pump, currently using tri-chlor pucks and cal-hypo system.

  16. Back To Top    #16

    Join Date
    Jul 2014
    Location
    St. Simons Island, GA
    Posts
    170

    Re: First real test results re: water balance

    At 9 PM, 53 drops or 26.5. Bedtime now.
    Home pool: Intex 11,400 gallon AG vinyl pool with sand filter & SWG. Taylor K-2006 test kit - coastal Georgia. I'm also in charge of the Elk's Lodge Pool, which is 55,000 gallons in-ground concrete with sand filter, 2 HP Hayward pump, currently using tri-chlor pucks and cal-hypo system.

  17. Back To Top    #17

    Join Date
    Jul 2014
    Location
    St. Simons Island, GA
    Posts
    170

    Re: First real test results re: water balance

    Good morning everyone! I must have pushed the wrong button on the pump so it was on timer and turned off sometime in the middle of the night. So, I performed 2 FC tests, one on the still water and a second after the water was well circulated by pumps. First one on still water = 51 drops (FC 25.5). 2nd one on moving water = 54 drops (FC 27).

    Someone please tell me what to do next.
    Home pool: Intex 11,400 gallon AG vinyl pool with sand filter & SWG. Taylor K-2006 test kit - coastal Georgia. I'm also in charge of the Elk's Lodge Pool, which is 55,000 gallons in-ground concrete with sand filter, 2 HP Hayward pump, currently using tri-chlor pucks and cal-hypo system.

  18. Back To Top    #18
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    First real test results re: water balance

    Good morning !
    You want to have your pump running for al least 30 min's before you do any testing. If you lost 1 ppm or less on your OCLT you've passed.
    Just some info for the future. 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  19. Back To Top    #19

    Join Date
    Jul 2014
    Location
    St. Simons Island, GA
    Posts
    170

    Re: First real test results re: water balance

    Thank you for the advice re: pump, Pwrstrk. Didn't know that. 3rd test of the morning came back at 52 drops or FC 26, so I reckon that means it passes. So, now I wait for another 5 days for the CYA to dissolve fully and get a proper test reading and just go back to the regular pump with SWG for 8 hours per day while I wait? (8 hours is 1 turnover of pool's volume.)
    Home pool: Intex 11,400 gallon AG vinyl pool with sand filter & SWG. Taylor K-2006 test kit - coastal Georgia. I'm also in charge of the Elk's Lodge Pool, which is 55,000 gallons in-ground concrete with sand filter, 2 HP Hayward pump, currently using tri-chlor pucks and cal-hypo system.

  20. Back To Top    #20
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    First real test results re: water balance

    You can let the FC drift down to normal FC levels for the CYA level. Then run the SWG.
    However long the pump needs to run to maintain FC levels. Doesn't mean you have to turn the water over once. Whatever it takes to keep FC in range. 😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

Page 1 of 2 12 LastLast

Posting Permissions

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