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Thread: Water tests question

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    Join Date
    Jun 2014
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    Water tests question

    Good evening I have been getting high ph and alk results with the last tests. I have a 21 ft round pool I believe it holds 10,000 gals of water. I had to empty it and patch a whole which seems to be leaking a little still so I have to refill a few inch of water every three days or so. Now I tested today an found my chlorine is low. I have a floating dispenser I have 1 1/2 3 inch tabs in there. What do you think of these numbers below

    6/21. 6/22 pm. 6/23
    Cl 1.0. Cl 0.4 Cl 0.2
    Ph 7.8. Ph 7.3. Ph 7.6
    Alk 173. Alk 164. Alk 160

    Any help would be great on what to do





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    Isaac-1's Avatar
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    Re: Water tests question

    I am going to make a guess at what is going on here, but it is just a guess as we do not have enough information.

    I am going to guess that before the drain you had been using trichlor pucks for a while, after the drain and refill you went right back to using them. I am also going to guess that you have fairly high pH fill water. Now the trichlor pucks do 3 things, they add FC, they add CYA and they are very acidic so they lower pH. The chlorine gets used up, and the CYA stabilizer builds up in the water, this CYA protects the Chlorine from breaking down under UV light from the sun. A little is good, but to much hampers the ability of the chlorine from doing its job which is why we generally advise against long term use of trichlor. So what you are likely seeing now is the effect of the CYA trying to lower the pH on the pool, and the replacement fill water raising it. Your FC is low because there is not enough CYA to protect it during the day from the sunlight.

    Again this is all a guess based on the little information we have.

    My advice is to read the pool school link in the upper right of this page and pay particular attention to the effects of chemicals section.

    Ike
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Water tests question

    Thank u for ur answer. As to give u more information about the pool idk anything about it I just moved into a home with a pool and it had a home water was drained out cleaned liner and patched hole like stated before. Idk the name of the CL tabs I am using being that I'm not by my pool. Can I test my water like I do with the pool water to see if it's high PH. What other CL can I use? I had a pool when I was younger and I did all the reading and now I forgot everything.im gonna try and get aside rent type of CL tabs. I'm also using a hayward filter an 1.5 HP pump. I will let u know what type of CL I am using



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    Smykowski's Avatar
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    Re: Water tests question

    Welcome to the forum! You are asking good questions, but the answer contains way too much information to put in a single post. Head over to Pool School and do some reading, starting with the link in my signature. Post questions for clarification.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Re: Water tests question

    hello I am home now and this is what my CL contains trichloro-s-triazinetrione.this is my most recent test that I did today
    cl 0.0
    ph 7.4
    alk 158

    should I change my CL tabs? should I shock the pool? should I use liquid CL? I read some things on the fourms here but couldn't do that much with kids running around. thank you for your help

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    Re: Water tests question

    I would think that this topic should be moved out of the Construction topic

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    Mod Squad JohnT's Avatar
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    Re: Water tests question

    Quote Originally Posted by Suncity View Post
    I would think that this topic should be moved out of the Construction topic
    It should, and it has been. Thanks for pointing it out.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
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