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Thread: Auto pilot nano not keeping up with chlorine level

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    Auto pilot nano not keeping up with chlorine level

    We have a 6 month old pool that has a auto pilot nano salt system.
    when the system was first started and was set a 50% it would keep the chlorine level at 7.5 free.
    we reduced the level to 25% and it dropped to 4.0 free. During that time we added muratic acid to keep ph levels in check. The need for acid slowed till is leveled off at about 48 oz a week.
    then we lost our chlorine level and had to add chlorine to keep a free level of at least 3.5.
    i contacted the pool contractor and was told to check the phosphate and nitrate levels.
    we had a phosphate level of 975 which we treated with phosfree and now have a 0 phosphate level.
    we still are not producing enough chlorine to keep a level without adding liquid chlorine.
    our water chemistry has been even this whole time with not changes.
    pool contractor sent out a service company and they checked the system and said it is working. I did see chlorine gas come off the element when it was in a bucket. They said it is a problem with the water. So I took a sample to their store without telling them who the service company was and explained my problem and they said it is a bad system as my water tests just fine. Not sure what to do at this point. Below is the current water chemistry.
    fc 0.5
    tc 0.28
    ph 7.4
    hardness 250
    alkalinity 100
    cya 66
    nitrate 10
    phosphate 0
    salt 3000
    system set at 95% but currently on boost system runs 7 hours a day
    have not had to add acid in 6 weeks since issue started
    volts 15.5 amps 5.5 amp hours 3200
    just added 128 oz of liquid chlorine to get a free level of 6.0

    pool is 10,000 gallons
    pebble tec finish
    solar cover is on
    phosphates were from city water supply none added since phosphate treatment


    I am about to give up on the salt system because no one can give me an answer

    thank you in advance for your help
    bill

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    Mod Squad Jimrahbe's Avatar
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    Re: Auto pilot nano not keeping up with chlorine level

    Bill,

    Welcome to TFP... A Great resource for all your saltwater pool questions...

    I've sat here for a few minutes thinking about how to respond to your questions..

    There are several tests that you can do that will verify if the SWCG is working or not, or if there is something in your pool that is eating the chlorine about as fast as your SWCG can produce it..

    The problem is without an accurate test kit, you don't have the ability to run any of the tests.

    One test that will tell you how much (if any) chlorine the cell is making is done by testing the FC level just after sundown and they again just before sunup. (With the SWCG on all night).. The difference in the FC levels will tell you how much chlorine the SWCG produced overnight when no chlorine should be consumed by your pool.

    Another similar test, is to test your FC just after sundown and again just before sunup. This time with the SWCG off all night. If the FC level drops more than 1 ppm, then some organic matter in your pool is eating the chlorine

    You can also capture the water out of a pool return with the SWCG running and then compare its FC level with the FC level taken in an area away form any return eyeball.

    This site is dedicated to pool owners testing their own water and then only adding just what is necessary to keep their pool water crystal clear, safe, and sanitized.

    if you are interested, you might want to read this... https://www.troublefreepool.com/cont...at-is-tfpc-bbb

    Thanks for posting,

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Caldera Spa.

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    Re: Auto pilot nano not keeping up with chlorine level

    Thank you Jim for your reply.
    i did test the water at the joint just past the cell with the unit on boost and the free chlorine level was only .3 higher than the free chlorine level at the deep end of the pool.
    i will do both of the tests you suggest to see if something is binding or burning up the free chlorine level

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    Mod Squad pooldv's Avatar
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    Re: Auto pilot nano not keeping up with chlorine level

    Welcome to TFP!

    9 times out of 8 when people think their SWG isn't keeping up it is because there is algae growing in the pool. I think the best way to check is to shut off the SWG and use bleach to raise FC up to 5 or 6 or 8ish and do an Overnight Chlorine Loss Test.
    TFP Moderator
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    Re: Auto pilot nano not keeping up with chlorine level

    I did the overnight test. The free cl starting level started at 9.1 and this am the free cl is at 6.4 so I am going to do the slam treatment and see if that will cure the issue.
    In regards to the water it is crystal clear but I can see tiny little bit of what looks like black algae in the grout lines in a few places just above the pebble finish.
    Thanks for the help and I will keep you posted

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    Mod Squad tim5055's Avatar
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    Re: Auto pilot nano not keeping up with chlorine level

    Quote Originally Posted by Billschultes View Post
    The free cl starting level started at 9.1 and this am the free cl is at 6.4 so I am going to do the slam treatment and see if that will cure the issue.
    I have a question and a comment.....

    What are you testing with to get a 9.1 FC level?

    Please understand that a SLAM is not a single "treatment", but is a process that can (and usually does) take days to complete.
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    kywildcats's Avatar
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    Re: Auto pilot nano not keeping up with chlorine level

    I have the same system, with no problems so far. What is the size of your SWG, and how big is your pool? It would be helpful if you added all info into your signature line. Good luck!!
    Mark
    20'x28' IG, Vinyl, (Sept 2015) 14,900 Gallon, 3'4 to 5'6 deep, Jandy Proflo 1.5 HP, 220v, 2 speed pump, Waterway Carefree 27" 400 LB Sand filter, Digital Nano plus SWG, TF-100 test kit /speed stir. Dolphin Primal x3 robotic cleaner

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    Re: Auto pilot nano not keeping up with chlorine level

    Just a quick note. A SLAM is a sustained process of testing and redosing chlorine until all three criteria are met. At the start of the SLAM you should test and redose as often as you can. Ever hour or so would be best. Once the need for redosing starts to drop, then you can extend the time between testing and redosing.

    Use the poolmath button at the top of the page to help guide you with your redosing.

    Here is the link to the SLAM process: Pool School - SLAM - Shock Level And Maintain


    {Guess I'm the slow typist for today}
    Bob - INTEX 12x24 owner (not setup yet), 'New to me' Kreepy Krauly Sand Shark, Test kit: TF-100 w/Speed Stir

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    Re: Auto pilot nano not keeping up with chlorine level

    Ok I started the slam and had no major drop in ft levels over weekend.
    so with auto pilot shut off the Fc level drops about .25 over night and 1.50 during the day in full sun with water temp at 88+.
    if I run the auto pilot for a 8 hour cycle the FC level drops at the same rate as without the auto pilot.
    so it's safe to say the it is not producing enough chlorine.
    my FC level and tc are exactly the same so cc should be 0
    water is gin clear if I add 10% liquid to keep fc level a 6.0

    what is the fourms suggestion on dealing with the manufacture as we are still only 6 months old?
    Pool completed oct 2016. 14'x24 lagoon style 9800 gallons auto pilot nano salt system pentair wisperflo 3/4 hppentair clean and clear 100 filter, pebbletec finish Tahoe blue,
    zodiac mx8 elite vacuum, universal rocks waterfall, color q 7 tester & Taylor 2006c

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    Mod Squad pooldv's Avatar
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    Re: Auto pilot nano not keeping up with chlorine level

    I would call the PB first, they should warranty the SWG.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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