Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 18 of 18

Thread: New pool, new test kit, chlorine disappearing

  1. Back To Top    #1

    Join Date
    May 2015
    Location
    Paxinos PA
    Posts
    57

    New pool, new test kit, chlorine disappearing

    So, our 16x30 IG pool was just installed end of July 2014. This year when we opened it on May 5th, the water looked great - could've swam in it (at least it looked that way). However, we have fought all season to keep chlorine in the pool. The pool store/pool installer tested for and said "phosphates." We did an abbreviated version Phos-Free treatment (long story ... ), had water re-tested by pool store and said "no phosphates - add 5# shock." Next morning, NO CHLORINE. Had water re-tested, again "phosphates." We've crippled along here adding shock just to keep some chlorine in the pool and not grow a whole lot of other stuff. The CYA had gone from 60 down to 30, then down to 15. So, we backwashed everything, even pulling the filter apart and washing everything off and added 8# CYA on 5/29. Per store recommendation, added 2# shock and had water re-tested because chlorine still wasn't holding. Same story ... "phosphates. You're going to have to do another Phos-Free treatment, but this time we'll just have you add 1/2 the bottle." They know my frustration with this Phos-Free process because I don't have the time to sit around and babysit a pump when the pressure gets too high --> can't bump the filter --> not getting adequate circulation --> might as well not even do the treatment. Plus, we were going to be away for 3 days, so we postponed that process until --maybe-- this weekend coming up (6/13-14). In the meantime, I figured my test kit would come in the mail. While we were away, my SIL added 2# TKO shock (calcium hypochlorite 73%, other ingredients 27%, free chlorine 70%) to the pool everyday. Maybe a little overboard, but it was the only way I could keep my sanity from afar knowing there wasn't stuff growing in the pool - hopefully.

    Before I posted for the first time, I wanted to get a TF-100 kit so I could be on the same page with everyone else. So, these were the results of my first testing run and this was after 3 days of 2# TKO shock.


    FC: 14
    CC: 0.5
    CH: 525
    TA: 130
    CYA: 60 (may be a little off -- over shot the reagent)
    PH: 7.5


    I was hoping we were finished with the high amounts of chlorine and I could prove the pool store incorrect about the phosphates. However, here are some results from this morning.

    FC: 8.5
    CC: 0
    CYA: ~70 (re-did since I messed this up yesterday)

    I know my CYA is too high to SLAM because I'd need such large amounts/high FC. I attribute the high CH from the TKO shock that was added 3 days in a row.

    I need help ... the lack of chlorine in the pool has been a bane in my side all season, so far. We removed 72 tri-axles of dirt to put the pool in ... I've threatened more than once to go bring them all back and fill the thing in and chalk it up to a VERY expensive learning experience.
    22,000 gal 16x34, IG, vinyl (7/14)
    DE Hayward Perflex extended cycle
    Hayward Super Pump
    Aquacal heat pump
    TF-100 test kit

  2. Back To Top    #2
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: New pool, new test kit, chlorine disappearing

    Welcome to the forum!

    We can get you out of this mess pretty easy, but you have unfortunately listened to poor advice. Chlorine makes phosphates irrelevant. Once you kill the Algae, and maintain good FC levels, it no longer matters. We have thousands of members who have no problems, and have no idea what their Phosphates are.

    You need to perform a SLAM on the pool. It is a process whereby you add a lot of FC to the pool, and you hold a given high level until the pool is clear. You do not let up on it, and it will work. I guarantee it 100%, but you have to follow the procedure to the letter. It takes a lot less Chlorine in terms of product used if you reduce the Cya first. The only way to do that reliably, is to do partial drains on the pool until you get it down to 30-40 at most. When you get there, you can SLAM with a lower level of FC and use much less. We will walk you through this, when you need help, but it will turn your pool around. Stop going back there, and follow the SLAM. Click the link in my signature to read about it. Once you reduce the Cya (stabilizer) you may need to adjust the pH before you start. Post back, let us know, and we can help.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  3. Back To Top    #3

    TFP Guide

    pabeader's Avatar
    Join Date
    May 2015
    Location
    Dallas Ga
    Posts
    4,064

    Re: New pool, new test kit, chlorine disappearing

    Is your water cloudy? I don't understand what your saying about the chlorine level. Looks like you've got more than enough in there...
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

  4. Back To Top    #4

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,082

    Re: New pool, new test kit, chlorine disappearing

    Phosphates are irrelevant.

    What does your water look like?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  5. Back To Top    #5
    Isaac-1's Avatar
    Join Date
    May 2010
    Location
    SW Louisiana
    Posts
    6,711

    Re: New pool, new test kit, chlorine disappearing

    This is just a guess, but is based on the overall tone of your frustration, so while you follow the SLAM process already mentioned look for hidden algae. Often even in a clear looking pools algae will find a nook or crevice where there is poor circulation, therefore low levels of chlorination and thrive. Common places are under ladders, or removable steps and behind light niches, check these places scrub and see if you find globs of green algae.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

  6. Back To Top    #6

    TFP Guide

    pabeader's Avatar
    Join Date
    May 2015
    Location
    Dallas Ga
    Posts
    4,064

    Re: New pool, new test kit, chlorine disappearing

    if the chlorination in that area is low, then how would the FC drop because of it?
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

  7. Back To Top    #7
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: New pool, new test kit, chlorine disappearing

    Welcome!

    Right here:
    Before I posted for the first time, I wanted to get a TF-100 kit so I could be on the same page with everyone else.
    That was the turning point. You can be in control now.

    The CYA is high, but not unreasonable. The CH is also high, but easily managed.

    The big question: what does the water look like now? Don't lose sight of the big picture. Crystal clear odorless sparkling water is the goal. All these test results do is assist us in keeping it that way.

    If you need to SLAM, take a deep breath, and start draining some water to lower CYA. This is it, the end of your wasted efforts. Even just taking it down to 50 CYA will be a big help. Before you start draining... recheck your pool volume. 16*30 rectangular pool would have to be 7 feet deep the whole pool to be 25000 gallons. If it's oval or freeform, it's going to hold less. And if you have a shallow end, the average depth will be even lower.

    Anyway, replace maybe 25% of the water. Let it mix. Adjust the pH, and hit it with bleach. Assuming you want this over with quick, keep on it every couple hours maintaining shock level for whatever your CYA end up. Scrub out the light niche and any ladders. You've seen the SLAM article, just follow it to the letter.

    This could well be the last time you don't see the bottom of the pool clearly, so take pictures.
    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!

  8. Back To Top    #8

    Join Date
    May 2015
    Location
    Paxinos PA
    Posts
    57

    Re: New pool, new test kit, chlorine disappearing

    Thank you everyone for your responses! I've been trolling around on TFP for a couple weeks checking out other suggestions and problems. I think this forum will be quite helpful!

    So, my husband tells me our pool is 16x34 and I dug out paperwork and yes, he is correct. The shallow end is 3' and the deep end is 8'. I thought I saw on here somewhere how to calculate the number of gallons that our pool would hold, but I couldn't find it when I needed it. So, I usually figure around 22,000-25,000?

    What does my pool look like?


    I think it currently looks crystal clear! There were some spots on the bottom last week that I would call "brown" that did not brush off or suck up in the vacuum. They bothered me enough that I donned a pair of goggles and dove to the bottom equipped with a Magic Eraser to remove them. Last week was not the first time I saw those spots. I would say when they did appear (in the past), they re-appeared in the same spots. I don't know if that's some kind of algae or mold?

    I did retest the FC & CC levels this afternoon after some light swimming:
    FC: 8 (drop of only 0.5ppm over the course of the day)
    CC: 0

    Oy. Do I dread the thought of draining out water to get the CYA down. We are on a well ... don't know how much water we can add to the pool from there. Other option: water tanker $145 a load (3500 gal). I have to contemplate that one a little bit.

    - - - Updated - - -

    Thank you everyone for your responses! I've been trolling around on TFP for a couple weeks checking out other suggestions and problems. I think this forum will be quite helpful!

    So, my husband tells me our pool is 16x34 and I dug out paperwork and yes, he is correct. The shallow end is 3' and the deep end is 8'. I thought I saw on here somewhere how to calculate the number of gallons that our pool would hold, but I couldn't find it when I needed it. So, I usually figure around 22,000-25,000?

    What does my pool look like?


    I think it currently looks crystal clear! There were some spots on the bottom last week that I would call "brown" that did not brush off or suck up in the vacuum. They bothered me enough that I donned a pair of goggles and dove to the bottom equipped with a Magic Eraser to remove them. Last week was not the first time I saw those spots. I would say when they did appear (in the past), they re-appeared in the same spots. I don't know if that's some kind of algae or mold?

    I did retest the FC & CC levels this afternoon after some light swimming:
    FC: 8 (drop of only 0.5ppm over the course of the day)
    CC: 0

    Oy. Do I dread the thought of draining out water to get the CYA down. We are on a well ... don't know how much water we can add to the pool from there. Other option: water tanker $145 a load (3500 gal). I have to contemplate that one a little bit.
    Attached Images Attached Images
    22,000 gal 16x34, IG, vinyl (7/14)
    DE Hayward Perflex extended cycle
    Hayward Super Pump
    Aquacal heat pump
    TF-100 test kit

  9. Back To Top    #9

    Join Date
    May 2015
    Location
    Paxinos PA
    Posts
    57

    Re: New pool, new test kit, chlorine disappearing

    Maybe I need a lesson on how to reply to posts since it appears I replied 3 times above
    22,000 gal 16x34, IG, vinyl (7/14)
    DE Hayward Perflex extended cycle
    Hayward Super Pump
    Aquacal heat pump
    TF-100 test kit

  10. Back To Top    #10
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: New pool, new test kit, chlorine disappearing

    That water looks awful darn good to me.

    The best way to determine if you need a SLAM is to do the overnight loss test. Yes, it's a PITA to set the alarm to be up before the sun to go test the FC level. And you'll have the pump on all night, which won't help your electric bill much.

    The keys are
    1) If you need to raise FC up to get it above 5, aim for 10. You must let it mix thoroughly - 1/2 hour pump on and some brushing to get things really stirred up - before you get your after-sunset sample.
    2) You want to leave the pump on and maybe make a few passes with the brush before sunrise to mix things up before getting your sample
    3) I'd use the 25 ml sample and count each drop as .2 FC just for this. You really want to be sure the loss is less than 1.0 0.6 and 0.8 will read as 1.0 if you use the smaller sample and count by .5 ... wouldn't you like to know absolutely that your loss was less than 1?

    If you pass, no SLAM is needed. Just maintain FC adequate for the CYA level and try to keep pH at the lower end of acceptable so you don't get any Calcium scaling. That's it. No need to strain the well.

    As for volume, the calculator at the bottom of poolmath says that 16*34* 5.5 (that's the average of 2' and 8' depths) holds 22400 gallons. If you discover over the next few months that you're consistently over or under shooting when you add chemicals, then you can fine tune that. For now, just plug that number in when you use poolmath.
    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!

  11. Back To Top    #11
    Mod Squad kimkats's Avatar
    Join Date
    Jul 2012
    Location
    Tallahassee, FL
    Posts
    26,689

    Re: New pool, new test kit, chlorine disappearing

    I do not think you did anything wrong. I have seen some double and triple posts in the past couple of days.

    That water/pool looks awesome!

    Do as Richard says with the Overnight test.

    Getting the good test kit was your best move ever for your pool!

    Hugs!!! You have already taken control of your pool!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

  12. Back To Top    #12

    Join Date
    May 2015
    Location
    Paxinos PA
    Posts
    57

    Re: New pool, new test kit, chlorine disappearing

    Thank you Richard320. I just measured my nighttime FC using the 25 mL sample. I know to run the pump overnight. However, does it matter if I cover the pool? Also, the heater is running at 84 degrees. Should I back the temperature down at all overnight? Does that alter the morning results?
    22,000 gal 16x34, IG, vinyl (7/14)
    DE Hayward Perflex extended cycle
    Hayward Super Pump
    Aquacal heat pump
    TF-100 test kit

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

    Re: New pool, new test kit, chlorine disappearing

    Covering it might introduce any algae stuck on the cover. I suppose it would be nice to know if it was something as simple as that! Heating, I don't know. Never ran my heater overnight.
    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 2015
    Location
    Paxinos PA
    Posts
    57

    Re: New pool, new test kit, chlorine disappearing

    Hmmmm, interesting. I never thought about algae on the cover. I'm going to leave that off tonight and I backed the heater down to 75 degrees. It's supposed to rain for the next 2 days anyway, so no point in heating the water for the next 2 days.
    22,000 gal 16x34, IG, vinyl (7/14)
    DE Hayward Perflex extended cycle
    Hayward Super Pump
    Aquacal heat pump
    TF-100 test kit

  15. Back To Top    #15

    Join Date
    May 2015
    Location
    Paxinos PA
    Posts
    57

    Re: New pool, new test kit, chlorine disappearing

    My FC last night: 6.2
    Left the solar cover off, pump running, heater down to 75 degrees over night

    My FC this morning: 5.6
    CC: 0.5

    Passed the OCULT test!
    22,000 gal 16x34, IG, vinyl (7/14)
    DE Hayward Perflex extended cycle
    Hayward Super Pump
    Aquacal heat pump
    TF-100 test kit

  16. Back To Top    #16
    Mod Squad kimkats's Avatar
    Join Date
    Jul 2012
    Location
    Tallahassee, FL
    Posts
    26,689

    Re: New pool, new test kit, chlorine disappearing

    OH yeah! SWEET! Now are you at the maintain part of enjoying a pool!

    Keep it up!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

  17. Back To Top    #17

    Join Date
    May 2015
    Location
    Paxinos PA
    Posts
    57

    Re: New pool, new test kit, chlorine disappearing

    Tried the OCLT the next night (6/9), but failed that one. Finally on 6/10 I decided to start the SLAM process. You can follow that at another thread I have "Here we go with the SLAM."
    22,000 gal 16x34, IG, vinyl (7/14)
    DE Hayward Perflex extended cycle
    Hayward Super Pump
    Aquacal heat pump
    TF-100 test kit

  18. Back To Top    #18
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: New pool, new test kit, chlorine disappearing

    Ok then, good deal. Just Make sure you don't let on it.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

Posting Permissions

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