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Thread: What the heck - "91" on SWG again

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    What the heck - "91" on SWG again

    I've only had this SWG running since May I believe and about a month ago I had a "91" - low salt flashing, but I thought that was a possibility since I had to drain a significant amount of water due to high salt. I added more salt, but it was still flashing. I soaked in vinegar as I read I should try. Well, for a month things have gone without a hitch, now a couple of nights ago it is flashing again. It is not low on salt. I actually had to go a little high on salt to get the SWG to stop flashing "low salt" last month and it the sticks still read higher than manual states. Do I really need to do the vinegar thing this often? I don't see how, but could this be happening because I unplugged the copper thing? Everything was fine before that. Sorry, so many questions - just a little frustrated. I'd really appreciate your help.

    Also, since I'm asking questions - I've read several things about borax softening the water. My daughter's hair is very coarse on the bottom 3-4 inches every time she gets out of the pool, so I have to be sure to rinse and condition it. Would adding this keep her hair from feeling this way?
    Intex 20'x10'x52" 5,835 gallon above ground; vinyl; Intex 2,650-Gallon Sand Filter Pump; Intex Krystal Clear Saltwater System Model CS8110.

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    JasonLion's Avatar
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    Re: What the heck - "91" on SWG again

    If your chemical balance is off you might need to clean the SWG cell quite often. If you post a full set of test results we can give you more specific advice. This has nothing to do with the copper thing.

    Borax won't have much effect on hair damage, might help just a little. Again, other levels being wrong can aggravate hair damage. If you post a full set of water test results we might see something else that might be causing it.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: What the heck - "91" on SWG again

    I just tested...

    FC 6
    CC .5
    TC 6.5
    CYA between 90 and 100
    TA 150
    pH 7.8 (I know a little high - it gets to 7.5 when I add the acid amount from pool calculator
    even though my goal is set at 7.2. ??
    Salt 4080 (Aquacheck test strips)

    FC changes a lot doesn't it? It was 6 on the morning of 7/16 and I was gone until 7/20. I tested that evening and it was 2. I added chlorine and m.a. as pool calculator told me, then I covered for a few days since no swimming was going to happen. When I uncovered it on 7/23 FC was 10. Obviously no loss from swimming or sun. The temperature was also felt very warm to the hand so we didn't get in. I left it uncovered. We swam yesterday and as you see above FC is 6. I hope all of that fluctuation is normal?

    So, does any of this give you any help on the "low salt" reading. Thank you.
    Intex 20'x10'x52" 5,835 gallon above ground; vinyl; Intex 2,650-Gallon Sand Filter Pump; Intex Krystal Clear Saltwater System Model CS8110.

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    JasonLion's Avatar
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    Re: What the heck - "91" on SWG again

    You are missing the CH level. Your TA is a little high, which means that "normal" CH levels could be enough to cause problems.

    FC will fluctuate, but you shouldn't let it get down as low as 2.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: What the heck - "91" on SWG again

    I'm sorry. CH is 360.
    Intex 20'x10'x52" 5,835 gallon above ground; vinyl; Intex 2,650-Gallon Sand Filter Pump; Intex Krystal Clear Saltwater System Model CS8110.

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    JasonLion's Avatar
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    Re: What the heck - "91" on SWG again

    You are right on the edge of calcium scaling, which is going to be causing problems for the SWG. You need to get PH down now and TA down in the long run to prevent future problems.

    There probably is scaling in the cell, so it will need to be cleaned. If you can get PH/TA down you should stop having repeating problems.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: What the heck - "91" on SWG again

    Thank you for your help. I haven't been able to get the TA down very much since I opened the pool. I believe I've read before (correct me if I'm wrong) try to get ph down to 7.2 and each time it gets to 7.6 get it back down again and that will help TA. I'm on my way out to add the acid now.
    Intex 20'x10'x52" 5,835 gallon above ground; vinyl; Intex 2,650-Gallon Sand Filter Pump; Intex Krystal Clear Saltwater System Model CS8110.

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    Re: What the heck - "91" on SWG again

    I'm going to clean the cell again by soaking it in the vinegar as the manual says. It calls for house grade vinegar - apple cider vinegar is what I have - does it have to be white or is apple cider vinegar okay?

    Do you have a better method to clean the cells, or is that the best way? Thanks.
    Intex 20'x10'x52" 5,835 gallon above ground; vinyl; Intex 2,650-Gallon Sand Filter Pump; Intex Krystal Clear Saltwater System Model CS8110.

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    JasonLion's Avatar
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    Re: What the heck - "91" on SWG again

    Many kinds of SWG are cleaned by soaking in a mixture of one part muriatic acid and four parts of water, soak until it stops foaming.

    Either way you clean it, you want to make sure that all white chalky residue is removed.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: What the heck - "91" on SWG again

    Great. I'll try that method. It sounds faster and hopefully more thorough. Thanks again.
    Intex 20'x10'x52" 5,835 gallon above ground; vinyl; Intex 2,650-Gallon Sand Filter Pump; Intex Krystal Clear Saltwater System Model CS8110.

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    Re: What the heck - "91" on SWG again

    Well, I used the muriatic acid and water to clean the cells. I saw nothing left on them even though I only saw a very, very small amount of a greenish or whitish substance. Anyway, I turned on the SWG and it ran smoothly for about 20-30 minutes then it started beeping and flashing low salt. I am very frustrated. I keep adding liquid bleach because my FC keeps going down.

    Here are the results from this a.m.
    FC 6
    CC 0
    TC 6
    CYA 90-100
    TA 120
    pH 7.5
    CH 360
    Salt 4020

    What do I do?
    Intex 20'x10'x52" 5,835 gallon above ground; vinyl; Intex 2,650-Gallon Sand Filter Pump; Intex Krystal Clear Saltwater System Model CS8110.

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    Re: What the heck - "91" on SWG again

    I guess I'll start adding salt even though test strips show I have over what I need. I'm concerned because can't you put in too much salt?
    Intex 20'x10'x52" 5,835 gallon above ground; vinyl; Intex 2,650-Gallon Sand Filter Pump; Intex Krystal Clear Saltwater System Model CS8110.

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    JasonLion's Avatar
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    Re: What the heck - "91" on SWG again

    You don't want the salt level over about 5,500. On the other hand, the salt test strips often read higher than actual, so who knows what your salt level really is.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: What the heck - "91" on SWG again

    Well, this is interesting. My daughter and I went swimming today, so I turned on the SWG just to see what would happen. It ran the complete 4 hours as it should. This evening when I got home it came on by itself at the "normal" time and it was flashing "low salt". Water temp this afternoon was 81 and this evening it is 83. That seems odd to me. Isn't it or is there something going on that you all understand that I don't?
    Intex 20'x10'x52" 5,835 gallon above ground; vinyl; Intex 2,650-Gallon Sand Filter Pump; Intex Krystal Clear Saltwater System Model CS8110.

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    JasonLion's Avatar
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    Re: What the heck - "91" on SWG again

    It is normal for the water temperature to go up during the day and still be warm in the early evening, but it is not normal for that to trigger the low salt light.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    No P in my ool's Avatar
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    Re: What the heck - "91" on SWG again

    It appears that you may have a bad unit. This has been encountered before. If it is still under warranty Intex will replace it.It has something to do with the electronics. Hope this helps.
    21' Leslies Beachland Ag Pool, 10,000 gallons, professionally installed (best money I ever spent) Hayward 16" sand filter w/Pentair two speed pump Fafco 4x20 solar heater,Aqua Trol RJ. Borates added. Hard plumbed.

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