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Thread: Intex SWG Low Salt Error

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    Intex SWG Low Salt Error

    This is getting a bit annoying lately... I've been through 2 in the last 2 summers, and now this one is (i'm guessing) on it's last leg as well. There is no way these things are meant to only run 4 hrs a day. I run it 12 (the max) and it can barely keep up. In fact... it doesn't... After running for 12 hrs (*during the day* as pool school suggests) and checking chlorine level in the evening, it's usually between 1-2.5... I check it again in the AM and it's the same (maybe a tad lower, but not enough to worry about shocking again). So i then use the calculator and add bleach to bring it to the high end for my CYA which is 80... My PH is about 7.5 - 7.6, and TA is about 100-110... I checked my salt again this AM after adding some a few days ago, and I'm right at 3200 ppm... About an hour ago, I walk out to have a smoke and hear beaping... It's register as low salt... REALLY????

    I seriously don't know what else to do here... My water is, for all intent purposes, perfect... Crystal clear, and looks amazing... but at the very least I shouldn't have to run the SWG at it's max to maintain... and like i said... it's not even doing that... not to mention the "low salt" error now...

    Is anyone else having this problem? ugghhh...
    27' Round Sharkline Venture 17K Gallon AGP
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    Jamison04's Avatar
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    Re: Intex SWG

    Well for reference last year (1st yr with intex swg) I was able to run it for 5 hours during the day to keep the cl level up around a 5ppm each day. This year is its second season and I am now having to run it 7 hrs a day just to be able to have my FC at 4ppm for the next morning which is still lower tha what I could get on a lesser run time last year. Sun and temp intensities are comparable between this year and last year at this same time, actually we were several degrees hotter this time last year. Have you cleaned the cell lately? Also I did find that I had algae growing inside the hand rail of the steps and now that I've gotten that cleaned out the levels are starting to run a tad higher each day so I may be able to knock the run time down a little bit. That was probably the reason for my longer run time this year up to this point. Fwiw I too had crystal clear water but having the algae in the rail was eating up all the cl each and every day. As for the low salt warning I don't have any clue on that as I've not had to experience that yet.

    24'x52" Artesian w/ Portifino liner - Hayward 1hp powerflo matrix w/24" sand filter - AquaTrol RJ SWG. Solar heating to come. -

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    Re: Intex SWG

    yes the cell is completely clean as of Sunday evening... i also just completed a shock about 2 weeks ago and have manually maintained a high enough chlorine level since... so there is absolutely nothing in this pool other than the water... lol...

    i even have a shade sail over top of 80% of the pool which blocks 98% of the UV... and of course i live in texas and am prepared to run the SWG longer than normal to combat chlorine loss, but this is ridiculous...
    27' Round Sharkline Venture 17K Gallon AGP
    Pentair SD80 26" Sand Filter
    Pentair Dynamo 1.5HP Dual Speed Pump
    45MPHP10 Stenner Pump
    Aquabot Pool Rover Jr.

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    elwood58's Avatar
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    Re: Intex SWG

    You do not mention how scaled it was when you cleaned it. You also do not mention your CH level.
    19204 Gallon L Shape with a 10X10 2nd Step Baja Ledge. Intellichlor IC-40, IntellipH, Cartridge Filter, Pentair Heater/Chiller (Heat Pump). Tons of Deck with Deck Jets. Construction Complete 6/5/17.

    "If you don't measure it, you can't manage it!"

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    UnderWaterVanya's Avatar
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    Re: Intex SWG

    Quote Originally Posted by DigiManTX
    After running for 12 hrs (*during the day* as pool school suggests) and checking chlorine level in the evening, it's usually between 1-2.5... I check it again in the AM and it's the same (maybe a tad lower, but not enough to worry about shocking again). So i then use the calculator and add bleach to bring it to the high end for my CYA which is 80... My PH is about 7.5 - 7.6, and TA is about 100-110... I checked my salt again this AM after adding some a few days ago, and I'm right at 3200 ppm... About an hour ago, I walk out to have a smoke and hear beaping... It's register as low salt... REALLY????
    Quote Originally Posted by DigiManTX
    i also just completed a shock about 2 weeks ago and have manually maintained a high enough chlorine level since... so there is absolutely nothing in this pool other than the water... lol...

    i even have a shade sail over top of 80% of the pool which blocks 98% of the UV... and of course i live in texas and am prepared to run the SWG longer than normal to combat chlorine loss, but this is ridiculous...
    Two things:

    1) Has the FC fallen to 1-2.5 during anytime since the last shock? If so you need to shock again.
    2) If the pool has that much shade you might need to treat like an indoor pool - that's not something I know enough about - but my understanding is that sunlight plays a role in the removal of CC's. With that much coverage - maybe you don't need CYA = 80.
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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    Re: Intex SWG

    Quote Originally Posted by elwood58
    You do not mention how scaled it was when you cleaned it. You also do not mention your CH level.
    scale was minimal... soaked it in vinegar for about 2 hrs and it was spotless... CH is at 170
    27' Round Sharkline Venture 17K Gallon AGP
    Pentair SD80 26" Sand Filter
    Pentair Dynamo 1.5HP Dual Speed Pump
    45MPHP10 Stenner Pump
    Aquabot Pool Rover Jr.

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    Re: Intex SWG

    Quote Originally Posted by UnderWaterVanya

    Two things:

    1) Has the FC fallen to 1-2.5 during anytime since the last shock? If so you need to shock again.
    2) If the pool has that much shade you might need to treat like an indoor pool - that's not something I know enough about - but my understanding is that sunlight plays a role in the removal of CC's. With that much coverage - maybe you don't need CYA = 80.
    1. yes, it has fallen that low... but that is with checking during the evening hours after the SWG has been running all day... and every night/morning i bring it back up to the high end manually with bleach... + my water is crystal clear... not a spec of green/white/yellow/ or any other indication of algae presence. even at 1-2.5.. it maintains a OCLT of less than 1 ppm...

    2. my CC's are at .5 or less... i guess technically it's not shaded, it's probably more for "us" than maintaining an adequate chlorine level... it still receives plenty of sun trust me...
    27' Round Sharkline Venture 17K Gallon AGP
    Pentair SD80 26" Sand Filter
    Pentair Dynamo 1.5HP Dual Speed Pump
    45MPHP10 Stenner Pump
    Aquabot Pool Rover Jr.

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    UnderWaterVanya's Avatar
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    Re: Intex SWG

    Quote Originally Posted by DigiManTX
    Quote Originally Posted by UnderWaterVanya
    1) Has the FC fallen to 1-2.5 during anytime since the last shock? If so you need to shock again.
    1. yes, it has fallen that low... but that is with checking during the evening hours after the SWG has been running all day... and every night/morning i bring it back up to the high end manually with bleach... + my water is crystal clear... not a spec of green/white/yellow/ or any other indication of algae presence. even at 1-2.5.. it maintains a OCLT of less than 1 ppm...
    In theory the minimum FC for your pool with a CYA of 80 and SWG is 4. Anytime you fall below that you should shock. Your point about the OCLT is true but I don't know if that holds for FC levels so low.
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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    linen's Avatar
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    Re: Intex SWG

    How does your water look?

    Quote Originally Posted by UnderWaterVanya
    In theory the minimum FC for your pool with a CYA of 80 and SWG is 4. Anytime you fall below that you should shock. Your point about the OCLT is true but I don't know if that holds for FC levels so low.
    UWV brings up two good points. With swg's, even though one of the advantages is being able to run lower on FC, you still need to maintain that minimum value or you risk organics getting a foothold. Also, UWV's point about doing a OCLT at low FC levels can be problimatic.

    I would raise your FC up with bleach/liquid chlorine to 21 ppm (FC shock level for 80 ppm cya per poolcalculator) and do another OCLT. You may have a low level of algae present that is consuming your chlorine.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Intex SWG

    Quote Originally Posted by UnderWaterVanya

    In theory the minimum FC for your pool with a CYA of 80 and SWG is 4. Anytime you fall below that you should shock. Your point about the OCLT is true but I don't know if that holds for FC levels so low.
    Right... i get what you're saying... my point to that was essentially if nothing is "eating/using" the chlorine at night, there is no real benefit to shocking... seems like i'm just losing chlorine to the sun and regular swimmers... LOL... although that is just me using logic... and well... that sometimes gets me into more trouble than it's worth...
    27' Round Sharkline Venture 17K Gallon AGP
    Pentair SD80 26" Sand Filter
    Pentair Dynamo 1.5HP Dual Speed Pump
    45MPHP10 Stenner Pump
    Aquabot Pool Rover Jr.

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    Re: Intex SWG

    Quote Originally Posted by linen
    How does your water look?

    Quote Originally Posted by UnderWaterVanya
    In theory the minimum FC for your pool with a CYA of 80 and SWG is 4. Anytime you fall below that you should shock. Your point about the OCLT is true but I don't know if that holds for FC levels so low.
    UWV brings up two good points. With swg's, even though one of the advantages is being able to run lower on FC, you still need to maintain that minimum value or you risk organics getting a foothold. Also, UWV's point about doing a OCLT at low FC levels can be problimatic.

    I would raise your FC up with bleach/liquid chlorine to 21 ppm (FC shock level for 80 ppm cya per poolcalculator) and do another OCLT. You may have a low level of algae present that is consuming your chlorine.
    see, now that one is going to bring about more questions... as i've said my water is crystal clear... and regardless of the FC being 1-2.5 in the evening and then again the same the next morning, what would it matter to bring it up so high as to shock levels again...? (to me) that doesn't make a whole lotta sense...if something is in there is working on the chlorine it would show itself at 1-2.5 OR at 21ppm... i would have a OCLT of greater than 1ppm as pool school describes...
    27' Round Sharkline Venture 17K Gallon AGP
    Pentair SD80 26" Sand Filter
    Pentair Dynamo 1.5HP Dual Speed Pump
    45MPHP10 Stenner Pump
    Aquabot Pool Rover Jr.

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    UnderWaterVanya's Avatar
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    Re: Intex SWG

    Quote Originally Posted by DigiManTX
    see, now that one is going to bring about more questions... as i've said my water is crystal clear... and regardless of the FC being 1-2.5 in the evening and then again the same the next morning, what would it matter to bring it up so high as to shock levels again...? (to me) that doesn't make a whole lotta sense...if something is in there is working on the chlorine it would show itself at 1-2.5 OR at 21ppm... i would have a OCLT of greater than 1ppm as pool school describes...
    I'm no expert - not by a long stretch. But my impression is that FC loss of 1ppm is a shorthand for some % loss. If you are already at 1-2.5 a 1ppm loss would be a 40-100% loss whereas at 21ppm a loss of 1ppm would be just under 5%. If your loss was 0.1ppm at 1ppm starting out that's still a full 10% loss.

    Granted - I'm just guessing...
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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    GreatCanadian's Avatar
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    Re: Intex SWG

    My pool is 8,000 gallons. My SWG is not one of the fancy expensive ones. It is a Bestway Hydroforce SWG. It supposedly is capable of putting out 24 grams per hour. The older Intex I believe are also capable of 24 grams per hour (of course this all depends on factors such as flow rate, salt content, etc.). The newer Intex SWG's are rated at 12 grams per hour. That being said, I run my chlorinator 2 hours per day and easily maintain a minimum FC of 4 ppm. My pool is covered with a solar blanket for most of the day - and we swim most evenings. On weekends the pool is in constant use (uncovered all day - weather permitting) and I run it for 4 hours per day (3 hours would be sufficient I think, but I don't have that setting). Judging from this, I do not think you should need to run your SWG for more than 4 hours per day. I'm guessing you could have organics consuming your chlorine. And I could also be totally wrong!!!

    GC
    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

  14. Back To Top    #14

    Re: Intex SWG

    Quote Originally Posted by UnderWaterVanya

    I'm no expert - not by a long stretch. But my impression is that FC loss of 1ppm is a shorthand for some % loss. If you are already at 1-2.5 a 1ppm loss would be a 40-100% loss whereas at 21ppm a loss of 1ppm would be just under 5%. If your loss was 0.1ppm at 1ppm starting out that's still a full 10% loss.

    Granted - I'm just guessing...
    LOL... ok, i see whatcha did there... now that makes sense... see... logic gets me in trouble...
    27' Round Sharkline Venture 17K Gallon AGP
    Pentair SD80 26" Sand Filter
    Pentair Dynamo 1.5HP Dual Speed Pump
    45MPHP10 Stenner Pump
    Aquabot Pool Rover Jr.

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