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Thread: Aquarite salt reading not matching salt in water

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    Aquarite salt reading not matching salt in water

    Hello. Hopefully someone can assist. I have a Viking fiberglass in-ground pool with an Aquarite Salt Chlorine Generator (T-9 cell). This is my 3rd Summer with the pool so I'm still learning how to take care of it.

    Anyway, the box has been reading approximately 600-700 higher than the actual salt reading in the water. At the moment, the box is at 3500 but the water test and my test strips only shows 2800. This has been causing us some issues with chlorine being generated. I tried re-calibrating by selecting Off, then Auto, but the salt number does not get below 3500 during the countdown. When the pool was opened in April, the difference was still 700 (1900/2600). I've since added several bags of salt. The system is recognizing the new salt being added, but both numbers are increasing by the same amount which isn't solving my problem. I had the T-9 cell tested this past weekend at Leslie's Pool Supply and it came back "OK." They told me to re-calibrate the system, which didn't work.

    Any suggestions? I sent a support message to Hayward but wanted to try here as well. Thank you in advance!

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    duraleigh's Avatar
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    Re: Aquarite salt reading not matching salt in water

    Yeah, the answer is fairly simple....make your SWG happy. If it wants salt, you will need to add salt regardless of what your tests say.

    If your SWG is happy and producing chlorine, leave the salt content alone.
    Dave S.
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    Re: Aquarite salt reading not matching salt in water

    Can you post the diagnostic readings?

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    Re: Aquarite salt reading not matching salt in water

    Quote Originally Posted by JamesW View Post
    Can you post the diagnostic readings?
    Thank you for the replies. My readings are as follows:

    82
    24.4
    3.94
    59p
    -3500
    RL-1
    r1.58
    t-9

    The problem with adding more salt is that increases the salt reading on the box, which in turn, prevents the system from generating chlorine. At least that's my understanding.... Thanks again.

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    Re: Aquarite salt reading not matching salt in water

    The aquarite almost never reads higher than actual if the correct cell is selected. If you have a t9 cell (see label on cell), then the 3500 is probably correct. Get a Taylor k-1766 salt test kit for accurate salt testing.

    3500 is ok. All your readings look good. Everything is working properly.

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    Re: Aquarite salt reading not matching salt in water

    Quote Originally Posted by JamesW View Post
    The aquarite almost never reads higher than actual if the correct cell is selected. If you have a t9 cell (see label on cell), then the 3500 is probably correct. Get a Taylor k-1766 salt test kit for accurate salt testing.

    3500 is ok. All your readings look good. Everything is working properly.
    Thanks James. What concerns me is the test strips (two different types) and the test at Leslie's all show the same result of 2800. So that's a difference of 700 from what the Aquarite is reporting. When the system showed 3000 last month, my chlorine level was very low and I assume that's because the actual salt level in the pool was only 2300. So I actually had to add chlorine at that time. Again, I'm far from an expert, but I think that difference of 700 is causing some problems.

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    Re: Aquarite salt reading not matching salt in water

    Trust me, get the K-1766 salt test kit. Your system is working properly. The salt reading from the AquaRite is almost definitely not too high (as long as the correct cell is selected).

    Also, note that salt readings can be +/- 400 ppm. Therefore, two different tests can be up to 800 ppm apart and still be considered to be in agreement.

    How many gallons is your pool?

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    Re: Aquarite salt reading not matching salt in water

    If you are having issues maintaining FC the first thing to do is Overnight Chlorine Loss Test to see if there is something organic in your pool using chlorine.
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    Re: Aquarite salt reading not matching salt in water

    The only other thing that I can think of that could cause the salt to read higher than actual would be if the temperature sensor in the cell was reading the water temperature as too low.

    If the cell selection is correct and the water temperature is accurate, the AquaRite is almost definitely not reading the salt as too high.

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    Aquarite salt reading not matching salt in water

    My t-15 always reads 400 over what I get on the k-1766 (after I let the water stabilize for a couple of days after salt addition). We have had so much rain I have added stabilizer and salt twice already this year.

    I just mentally note that my actual salt value is 400 less than the aqua rite reading.


    Free form 17X30. 14,500 Gal. Pentair sand filter and 1.5 hp pump. Aqua-Rite SWCG. TF-100 Test Kit w/Speed Stir

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    Re: Aquarite salt reading not matching salt in water

    400 ppm is within the margin of error. The readings should not be considered to be in disagreement.

    The key is to watch trends and averages and to watch for divergence from the trends.

    It could be that the actual salt level is halfway between the k-1766 and the AquaRite.

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    Aquarite salt reading not matching salt in water

    I agree James. Maybe a question I have will also help the OP. If my SWG will produce chlorine between 2500 and 3700, does it actually produce more chlorine at the higher reading? I do not recall anyone asking this in threads I have read. I have been at both readings. At the low I cannot taste the salt but I can at the high end


    Free form 17X30. 14,500 Gal. Pentair sand filter and 1.5 hp pump. Aqua-Rite SWCG. TF-100 Test Kit w/Speed Stir

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    Re: Aquarite salt reading not matching salt in water

    The AquaRite does produce more chlorine at higher salinity and/or water temperature.

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    Re: Aquarite salt reading not matching salt in water

    Thank you for all the responses. I have been in contact with Hayward as well. They suggested my T-9 cell could have been mis-labeled and may actually be a T-15. That seems like a real long shot. I will try the other suggestions from this thread. Thanks again.

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    Re: Aquarite salt reading not matching salt in water

    If its a mislabeled t15 they should be able to point you to structural physical differences to confirm it
    Doug - Purchased 1/2016, 1995 house with 16x31 ft, ~23000 gallon Gunite pool w 11x7 spa, 3 Pentair VS pumps, a boost pump for polaris 3900 and a BaduŽ Jet super-sport swim jet pump, 1.5 hp blower, a CL460 Cartridge filter. TF-100 test kit. Aquapure SWG, iAqualink - Lots to learn. New Aquabright, Jandy LEDs, CMP LED Sheers.

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    Re: Aquarite salt reading not matching salt in water

    The only difference is the titanium plate length, which is hard to measure inside the cell. The t-15 plates are 2.5" x 5-15/16".

    I would suggest getting the k-1766. If the k-1766 is way lower than the AquaRite, switch the cell type to t-15 and see if the salt reading on the AquaRite matches the k-1766.

    It's possible that the cell could be mislabeled but I think that it's very unlikely.

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    Re: Aquarite salt reading not matching salt in water

    Thanks all. It wasn't the cell type as I suspected. That dropped the salt reading to 2200, which was still off by 600 (in the opposite direction). James, I'm going to order the k-1766 kit to see what type of results I get with that. While my AquaChek strips and Leslie's both showed 2700, I suppose there's a chance they could both be wrong. As of last night, my box reads 3500.

    I'm not expecting an exact match, but I'd like to be within the margin of error. Right now, 600-700 is outside of that margin. Thanks again for all the advice. It's appreciated.

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