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Thread: Show-n-tell: Community Pool Test Numbers

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    JayBauman's Avatar
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    Show-n-tell: Community Pool Test Numbers

    In the heat of yesterday's late afternoon sun, the kids and I left our pool and ventured across the street to our community pool, which is cared for by the HoA. Just for fun, I brought my TF-100 along to see what I could learn. This pool is relatively new and was put into service just about a year ago. Other than there being a bit of dirt/sand on the blindingly-white bottom, the pool looked great and the water was sparklingly spectacular. Then I started characterizing the chemistry:

    pH 8.2
    FC 3.0
    CC 0
    CH 475
    Alk 90
    CYA 75


    I'm a bit surprised by the pH. I have a hard time keeping mine within range, but I don't think I've ever seen 8.2 since startup. CH is the most inexplicable. I assume they use the same water that I do, and I have to add a fair amount of minerals to keep my calcium levels correct (fill water ~150 or so).

    Since I know what I'm talking about (Thanks TFP!!!), the most concerning thing to me is the chlorine/stabilizer ratio. I would be targeting a minimum of 5-6 with CYA at 75, but the pool looks great. Is it correct to assume that 3.0 is high enough for disinfection? I'm assuming that they're using some sort of algae treatment to keep the pool looking so great with such low FC levels.

    Anybody else take their chemistry fun set over to their local public pools and see what's happening?
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    Mod Squad kimkats's Avatar
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    Re: Show-n-tell: Community Pool Test Numbers

    Just think.......the PH could be OVER 8.2

    The CH could be from the plaster if it really that new.

    The FC and CYA could be a problem BUT what was it first thing in the morning and during the night. The FC of 3 in the late,hot,high bather load could explain the 3.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Show-n-tell: Community Pool Test Numbers

    That FC should be alright at 75 CYA to disinfect, bacteria and viruses are killed at much lower chlorine levels than algae. Not that I would want to get in if it was full of people. You are probably right, I would say either algaecide or phosphate remover.

    I can't test public pools, it would just cause me to pull my daughter out of it in terror. I don't want to be "that guy."

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    Texas Splash's Avatar
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    Re: Show-n-tell: Community Pool Test Numbers

    Kind of like having the opportunity to inspect the kitchen at your favorite restaurant. Some things are better left un-seen.
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    Re: Show-n-tell: Community Pool Test Numbers

    Quote Originally Posted by Donldson View Post
    ....I can't test public pools, it would just cause me to pull my daughter out of it in terror. I don't want to be "that guy."....
    Same.

    Still very new to TFP, but I know just enough to be dangerous. I would hate to know what we were swimming in!
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    JayBauman's Avatar
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    Re: Show-n-tell: Community Pool Test Numbers

    Quote Originally Posted by kimkats View Post
    The FC of 3 in the late,hot,high bather load could explain the 3.
    No problem with bather load. This was late afternoon, heat index 108°. I've never seen any more than 1 person at a time in our community pool. (That's my twins getting ready to jump in the "deep" end....)

    Community Pool.jpg

    - - - Updated - - -

    Quote Originally Posted by Texas Splash View Post
    Kind of like having the opportunity to inspect the kitchen at your favorite restaurant. Some things are better left un-seen.
    Quote Originally Posted by Donldson View Post
    I don't want to be "that guy."
    The community pool opened up in May. I've been able to resist the urge to take my test kit over for the last 3 months. Yesterday I succumbed to the temptation. Time to hop back on the wagon....
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    Re: Show-n-tell: Community Pool Test Numbers

    Or they could be lucky that their water is low in algae nutrients and that they don't have phosphates in the fill water with lots of evaporation and refill. There are many pool owners who use Trichlor regularly, have high CYA, don't use supplemental products (e.g. algaecide or phosphate remover) and don't have problems in their pools. That's why they don't always believe what we talk about here. It is not necessary to use algaecide or phosphate remover to have pool water that doesn't grow algae quickly in spite of low FC/CYA levels; it can be naturally (initially) low in algae nutrients.
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    Re: Show-n-tell: Community Pool Test Numbers

    Are you sure they don't have any form of supplemental treatment? I doubt you were allowed to look in the pumping room.
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    Mod Squad kimkats's Avatar
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    Re: Show-n-tell: Community Pool Test Numbers

    That is a pretty pool. I like the set up with the tanning ledge and jumping off wall!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Mod Squad JohnT's Avatar
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    Re: Show-n-tell: Community Pool Test Numbers

    My bet is they shock it regularly with cal hypo. Lets them get away with the lower chlorine level and explains the high calcium level.
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    mickey4paws's Avatar
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    Re: Show-n-tell: Community Pool Test Numbers

    Looks like a nice pool and big. Maybe the PH is so high because of those 3 water jet thingies? We have a nearby community pool but I'd be too afraid to find out what the chemistry is. You're brave, Jay I think I've turned into a snob. Ever since we got a pool, I won't swim in a public pool.
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    JayBauman's Avatar
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    Re: Show-n-tell: Community Pool Test Numbers

    Quote Originally Posted by mickey4paws View Post
    Looks like a nice pool and big. Maybe the PH is so high because of those 3 water jet thingies? We have a nearby community pool but I'd be too afraid to find out what the chemistry is. You're brave, Jay I think I've turned into a snob. Ever since we got a pool, I won't swim in a public pool.
    Your point is exactly why I decided to test the water. Sometimes the family likes to go over to the public pool (beats the heck outta me as to why!), so I wanted to see what we're getting into over there. For the single data point that I now have, the water seems to be OK for swimming.

    So here's the funny part. I have an SWG, and sometimes I get tired of the salty taste of my pool water. After swimming a few laps in the community pool (decidedly NOT SWG), I realized the water has such a "flat" taste. I couldn't wait to get back to my backyard paradise for the salty taste and silky feeling. I guess TFP has made me into a pool snob.
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    Re: Show-n-tell: Community Pool Test Numbers

    Sidebar...I was swimming last week in Jamaica and Cozumel and was longing for the 'normal' salt water taste rather than the stuff that burned my throat.
    Central TX / 12K GAL / IG / SWG / DE filter / Pentair SVRS & 3 swim jet pumps / Spa bench and jets / Single body of water / No heater.

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