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Thread: Unexplained FC Consumption - SOLVED - although the Mystery Remains

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    Unexplained FC Consumption - it's back again!

    So for those that have great memories...I am struggling to keep by pool clear this year.

    I totally understand the TFP methods and they rock...problem is my FC is all over the board.

    I am at my last straw...meaning I am totally confused...thought I had an Ammonia problem, then I passed OCLT, see below.

    Just finished a SLAM with and passed the OCLT with flying numbers...went from 7.5 FC with 0 CC to 7.0 FC and 0 CC overnight...YEAH.

    Decided to keep FC just a bit higher to make sure, so dosed accordingly to add 5 PPM of FC.

    30 minutes after dose I test FC and my FC is 7.5 ???

    So unless I lost 5 PPM from 7 AM - 12 PM with a CYA of 40 in a covered (solar) pool - I am clueless.

    What other info do you need to try and help. Could Ammonia problem be so wacky and still be my problem ?

    OR could my DPD or R-0871 be screwed up and giving me false results...and thus causing my FC to be way off (However I use a stenner, so my doses are very consistent)
    Last edited by toofast; 05-13-2015 at 01:58 PM. Reason: trying to update title.
    14,750 GAL IG Fiberglass (16 x 33) NE Ohio || Jandy 1HP 2 speed Pump || Waterco MultiCyclone 16 Centrifugal pre-filter (removed due to not working with sand filter) || 30" 575 Lb. Sand Filter || AquaCal 140K BTU Heat Pump || Solar Cover || Inter-fab Adrenaline Slide || GLI Monsoon Solar Cover Reel || K-2006C Test Kit || BBB with Liquid Chlorine Stenner Injection || Rayner Mighty Mesh Winter Cover

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    Mod Squad jblizzle's Avatar
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    Re: Could bad DPD or R-0871 cause wacky results

    If you had ammonia, you should be seeing CC numbers.
    The pump was running after you added chlorine right?

    Try adding some chlorine and testing the FC and CC after 30 minutes and lets make sure you see a rise and not that it was lost in the 5 hours (which could be possible).

    It would be very rare for the powder to have a problem. How do you store your test kit?
    Jason, TFP Moderator
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    Re: Could bad DPD or R-0871 cause wacky results

    As for Ammonia - yeah that is kind of what I thought...during this WHOLE MESS I never had CC above .5

    Yes, pump was running on low when injecting, then on high for 30 min after to get accurate mix. Was also running overnight on low when passed test overnight.

    Test kit is stored inside in covered uv resistant box in dark under a cupboard. in winter stored in dark cool basement. Both DPD and 871 are on second season.

    I will do the test and see what we come up with...still BAFFELED how I lost 5 PPM in 5 hours -but that is a different story I guess. Stay tuned...the test will have to be later this evening though.
    14,750 GAL IG Fiberglass (16 x 33) NE Ohio || Jandy 1HP 2 speed Pump || Waterco MultiCyclone 16 Centrifugal pre-filter (removed due to not working with sand filter) || 30" 575 Lb. Sand Filter || AquaCal 140K BTU Heat Pump || Solar Cover || Inter-fab Adrenaline Slide || GLI Monsoon Solar Cover Reel || K-2006C Test Kit || BBB with Liquid Chlorine Stenner Injection || Rayner Mighty Mesh Winter Cover

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    Mod Squad jblizzle's Avatar
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    Re: Could bad DPD or R-0871 cause wacky results

    Well, the CYA protects a % of the FC ... so the higher the FC level, the more ppm you will lose. Although 5ppm in a covered pool with 40ppm CYA and in the morning hours seems a bit high.

    Does not sound like you actually tested the FC around 12.5ppm though ... so maybe it did not actually rise that much.
    Jason, TFP Moderator
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    Re: Could bad DPD or R-0871 cause wacky results

    Slightly confused on your second point...meaning no I did not get a FC test at 12.5.

    But if my FC test of 7.5 is accurate, what it meant was that the 5 PPM of FC I injected with my stenner were "eaten" by something or my FC Dropped from 7 to 2 between 7 AM and Noon.
    14,750 GAL IG Fiberglass (16 x 33) NE Ohio || Jandy 1HP 2 speed Pump || Waterco MultiCyclone 16 Centrifugal pre-filter (removed due to not working with sand filter) || 30" 575 Lb. Sand Filter || AquaCal 140K BTU Heat Pump || Solar Cover || Inter-fab Adrenaline Slide || GLI Monsoon Solar Cover Reel || K-2006C Test Kit || BBB with Liquid Chlorine Stenner Injection || Rayner Mighty Mesh Winter Cover

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    Mod Squad jblizzle's Avatar
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    Re: Could bad DPD or R-0871 cause wacky results

    My point is ... maybe you did not actually inject 5ppm worth of chlorine ... maybe it is weaker or maybe it is not injecting as much as you think.
    I though you tested 7.5 and then added 5ppm worth (not use the stenner), but did not test a 12.5ppm 30 minutes after adding it to confirm you had actually reach that level.
    Jason, TFP Moderator
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    Re: Could bad DPD or R-0871 cause wacky results

    Gotcha...totally understand.

    My stenner is/was dead accurate - meaning I always do a calibration run, i.e. inject into a measuring cup against time to validate....and the bleach (brand new) is disappearing from the Stenner Jug.

    I will try manually dosing (when not traveling) and try to pin point this madness.
    14,750 GAL IG Fiberglass (16 x 33) NE Ohio || Jandy 1HP 2 speed Pump || Waterco MultiCyclone 16 Centrifugal pre-filter (removed due to not working with sand filter) || 30" 575 Lb. Sand Filter || AquaCal 140K BTU Heat Pump || Solar Cover || Inter-fab Adrenaline Slide || GLI Monsoon Solar Cover Reel || K-2006C Test Kit || BBB with Liquid Chlorine Stenner Injection || Rayner Mighty Mesh Winter Cover

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    Re: Could bad DPD or R-0871 cause wacky results

    The amazing Chlorine consumption continues....

    9 PM EST - 1.0 FC - a drop from 7.5 a bit after noon. CC is reading 0.0

    Added 2 gallons manually of 5.25% to bring up to about 8 PPM of FC - will retest in a bit and post results.

    I have a new disease - stand by
    14,750 GAL IG Fiberglass (16 x 33) NE Ohio || Jandy 1HP 2 speed Pump || Waterco MultiCyclone 16 Centrifugal pre-filter (removed due to not working with sand filter) || 30" 575 Lb. Sand Filter || AquaCal 140K BTU Heat Pump || Solar Cover || Inter-fab Adrenaline Slide || GLI Monsoon Solar Cover Reel || K-2006C Test Kit || BBB with Liquid Chlorine Stenner Injection || Rayner Mighty Mesh Winter Cover

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    Re: Could bad DPD or R-0871 cause wacky results

    Well....guess what...40 minutes later

    FC - 8.0
    CC - 0.0

    I am totally clueless what is eating my FC - it must be some invisible strain of algae

    Honestly, what else could it be...

    I will do another OCLT and report what I find in the AM. Anything else you think I should do, just yell.
    14,750 GAL IG Fiberglass (16 x 33) NE Ohio || Jandy 1HP 2 speed Pump || Waterco MultiCyclone 16 Centrifugal pre-filter (removed due to not working with sand filter) || 30" 575 Lb. Sand Filter || AquaCal 140K BTU Heat Pump || Solar Cover || Inter-fab Adrenaline Slide || GLI Monsoon Solar Cover Reel || K-2006C Test Kit || BBB with Liquid Chlorine Stenner Injection || Rayner Mighty Mesh Winter Cover

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    Mod Squad jblizzle's Avatar
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    Re: Could bad DPD or R-0871 cause wacky results

    Hmmm ... lets see what the OCLT says. That is excessive loss to attribute to just the sun.
    Jason, TFP Moderator
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    Re: Could bad DPD or R-0871 cause wacky results

    FC. 6.0
    CC. 0.0

    So a little loss... I guess I should also add that yesterday evening five kids swim for 4 hours...

    14,750 GAL IG Fiberglass (16 x 33) NE Ohio || Jandy 1HP 2 speed Pump || Waterco MultiCyclone 16 Centrifugal pre-filter (removed due to not working with sand filter) || 30" 575 Lb. Sand Filter || AquaCal 140K BTU Heat Pump || Solar Cover || Inter-fab Adrenaline Slide || GLI Monsoon Solar Cover Reel || K-2006C Test Kit || BBB with Liquid Chlorine Stenner Injection || Rayner Mighty Mesh Winter Cover

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    Re: Could bad DPD or R-0871 cause wacky results

    Well the kids could certainly account for some of that loss.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Could bad DPD or R-0871 cause wacky results

    Quote Originally Posted by jblizzle View Post
    Well the kids could certainly account for some of that loss.
    Fair enough...so we (at least myself) is back to being 100% stumped...

    Or can I somehow have some kind of invisible algae consuming chlorine and I need to SLAM over many many days to kill this unknown animal...if you remember, I travel a TON, so being able to SLAM over 4-5 days is impossible. (unless I take a vacation)

    Best I can do is SLAM for a few days....pass OCLT then get on a plane.

    Based on everything I know...it seems I have a bizarre strain of invisible algae, sucking most of my FC (never creating any CC) and because I can't SLAM for a week on end, somehow it is surviving and when my FC drops to NORMAL levels...it is strong enough to EAT that FC ?????

    Added this thought....perhaps I am a candidate for polyquat to help me with this ?

    Any other ideas ?
    Last edited by toofast; 06-17-2014 at 09:12 AM. Reason: added more info
    14,750 GAL IG Fiberglass (16 x 33) NE Ohio || Jandy 1HP 2 speed Pump || Waterco MultiCyclone 16 Centrifugal pre-filter (removed due to not working with sand filter) || 30" 575 Lb. Sand Filter || AquaCal 140K BTU Heat Pump || Solar Cover || Inter-fab Adrenaline Slide || GLI Monsoon Solar Cover Reel || K-2006C Test Kit || BBB with Liquid Chlorine Stenner Injection || Rayner Mighty Mesh Winter Cover

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    Re: Could bad DPD or R-0871 cause wacky results

    Are you sure your CYA readings are accurate? From checking your posts it seems like you are only losing chlorine during the day...
    16 x 32 inground vinyl pool (21000 gallons) (new liner installed 2014)
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    Hayward C1200 cartridge filter (new 2014)
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    Re: Could bad DPD or R-0871 cause wacky results

    Quote Originally Posted by Sminor View Post
    Are you sure your CYA readings are accurate? From checking your posts it seems like you are only losing chlorine during the day...
    Great question....so I've tested (last was 3 days ago) CYA 4-5 times. Each time the results were as expected....i.e. started with 0 in spring - added enough to 20, week later CYA 20.

    Last 2 tests were to validate target of 40 (after adding stabilizer) and both times I was clearly at LEAST 40, maybe a bit more.

    I will certainly TEST AGAIN - but I have testing for CYA for some time and I do feel my numbers are accurate....but all things are possible. I will retest again to validate.
    14,750 GAL IG Fiberglass (16 x 33) NE Ohio || Jandy 1HP 2 speed Pump || Waterco MultiCyclone 16 Centrifugal pre-filter (removed due to not working with sand filter) || 30" 575 Lb. Sand Filter || AquaCal 140K BTU Heat Pump || Solar Cover || Inter-fab Adrenaline Slide || GLI Monsoon Solar Cover Reel || K-2006C Test Kit || BBB with Liquid Chlorine Stenner Injection || Rayner Mighty Mesh Winter Cover

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    Re: Could bad DPD or R-0871 cause wacky results

    Ok 12:30 PM results, last test at 6 AM showed FC at 6 PPM

    NOW it is FC 8.5 / CC 0

    I injected enough chlorine to get to FC 11 - so that means in 6 hours (3 without sun) I lost 2.5 PPM - WAY TOO MUCH.

    Water still clear.

    Next steps...retest CYA when I land and then retest stenner to see if dosing is wacked out (but not sure how the pump all of a sudden starts dosing at 50% the rate it normally does.

    Any other ideas....or questions, just yell!
    14,750 GAL IG Fiberglass (16 x 33) NE Ohio || Jandy 1HP 2 speed Pump || Waterco MultiCyclone 16 Centrifugal pre-filter (removed due to not working with sand filter) || 30" 575 Lb. Sand Filter || AquaCal 140K BTU Heat Pump || Solar Cover || Inter-fab Adrenaline Slide || GLI Monsoon Solar Cover Reel || K-2006C Test Kit || BBB with Liquid Chlorine Stenner Injection || Rayner Mighty Mesh Winter Cover

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    Mod Squad jblizzle's Avatar
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    Re: Could bad DPD or R-0871 cause wacky results

    Sure seems like everything is pointing to the Stenner adding less than you think.
    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
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    Re: Could bad DPD or R-0871 cause wacky results

    Quote Originally Posted by jblizzle View Post
    Sure seems like everything is pointing to the Stenner adding less than you think.
    Yep I agree...I am baffled though as last year I could easily dose the rates less than 50% of what I am doing now.

    I will continue testing....
    14,750 GAL IG Fiberglass (16 x 33) NE Ohio || Jandy 1HP 2 speed Pump || Waterco MultiCyclone 16 Centrifugal pre-filter (removed due to not working with sand filter) || 30" 575 Lb. Sand Filter || AquaCal 140K BTU Heat Pump || Solar Cover || Inter-fab Adrenaline Slide || GLI Monsoon Solar Cover Reel || K-2006C Test Kit || BBB with Liquid Chlorine Stenner Injection || Rayner Mighty Mesh Winter Cover

  19. Back To Top    #19

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    Re: Could bad DPD or R-0871 cause wacky results

    Plus my bleach in the container is disappearing unless the neighborhood kids are stealing it wait I live in the country there's no kids

    14,750 GAL IG Fiberglass (16 x 33) NE Ohio || Jandy 1HP 2 speed Pump || Waterco MultiCyclone 16 Centrifugal pre-filter (removed due to not working with sand filter) || 30" 575 Lb. Sand Filter || AquaCal 140K BTU Heat Pump || Solar Cover || Inter-fab Adrenaline Slide || GLI Monsoon Solar Cover Reel || K-2006C Test Kit || BBB with Liquid Chlorine Stenner Injection || Rayner Mighty Mesh Winter Cover

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    Re: Could bad DPD or R-0871 cause wacky results

    I've never used a Stenner but I assume it's a peristaltic pump - and any degradation of the pump tube can cause dosing problems. If you have a spare, just change the tube before making any pump adjustments.

    Just my .02
    16 x 32 inground vinyl pool (21000 gallons) (new liner installed 2014)
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