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Thread: Pool Store Gets It Wrong Again

  1. Back To Top    #1

    Join Date
    Mar 2011
    Location
    Houston, Texas
    Posts
    413

    Pool Store Gets It Wrong Again

    Yesterday I needed more MA so I took a water sample to one of my pool supply stores for a test. Here are their results and my commentary:

    FC 4 (probably too low)
    TC 4 (CC=0 is correct)
    pH 7.8 (probably correct)
    TA 80 (too low)
    CYA 90 (too high)
    CH 340 (???)
    Salt 3700 (probably accurate)
    Phospates 500 ppb (who cares)

    Here are my results this morning with the TF-100

    FC 7
    CC 0
    ph 7.8
    TA 130
    CYA 70
    CH 480 (???)


    The best part of the story is that after testing the water the guy looks at me with a very sincere look and asks how my water looks. I said it's perfect--could not be better. He looked confused and asked if I was sure. I said of course I'm sure and asked him why he would think otherwise. He said my phosphates were so high that I probably have algae. I smiled and said I'm not concerned about algae at my present chlorine levels.

    Again, don't trust the pool store test results.
    9,200 gal. Gunite Luna Quartz French Grey pool with spill over spa, two fountains on tanning ledge (rarely used)
    Pentair Whisperflo 2HP, Pentair CCP Cartridge 420 Sq. Ft., Polaris 280 with booster pump
    Pentair EasyTouch 4, RayPak LoNox 266k Natural Gas heater, Aqua Rite SWCG T Cell 9, Borates, TF-100 test kit

  2. Back To Top    #2
    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Pool Store Gets It Wrong Again

    One sad thing about it is that phosphates at 500 aren't really very high. My phosphates have been up to 4,000, now that is high.

    With TA around 130 and CH at 480 you need to be careful to never let PH go above 7.8 and ideally you should keep PH lower than that. Longer term you should think about lowering TA.
    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

  3. Back To Top    #3

    Join Date
    Mar 2011
    Location
    Houston, Texas
    Posts
    413

    Re: Pool Store Gets It Wrong Again

    Understood. I have been trying to lower TA by taking pH to 7.2 and aerating. Two days ago my test kit showed it was 90 and I thought I was making progress. I added a little water (lost to evaporation) to the pool and now it says 130. My fill water is in the 130-140 range. We need some rain in SE Texas.

    [edit] I just tested my fill water's TA. It is 220.
    9,200 gal. Gunite Luna Quartz French Grey pool with spill over spa, two fountains on tanning ledge (rarely used)
    Pentair Whisperflo 2HP, Pentair CCP Cartridge 420 Sq. Ft., Polaris 280 with booster pump
    Pentair EasyTouch 4, RayPak LoNox 266k Natural Gas heater, Aqua Rite SWCG T Cell 9, Borates, TF-100 test kit

  4. Back To Top    #4

    Join Date
    Mar 2007
    Location
    Coastalish 'down easter'
    Posts
    4,160

    Re: Pool Store Gets It Wrong Again

    Quote Originally Posted by HouTex
    Understood. I have been trying to lower TA by taking pH to 7.2 and aerating. Two days ago my test kit showed it was 90 and I thought I was making progress. I added a little water (lost to evaporation) to the pool and now it says 130. My fill water is in the 130-140 range. We need some rain in SE Texas.

    [edit] I just tested my fill water's TA. It is 220.
    That sucks, but you know how to deal with it

    (Any chance you can catch rain water and use that to refill the pool, when you need to do so?)
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

  5. Back To Top    #5

    Re: Pool Store Gets It Wrong Again

    Waste, you don't know just how bad we are hurting for lack of rain here. All that rain and stormy weather the mid-section and north has been getting is usually ours in the spring. We are at about half of the typical rainfall level now, and in June it sometimes quits raining completely so that early spring rain is vital.

    The chinch bugs were so bad in my lawn, I thought they were ants at first when I ruffled the grass to see what was the matter. Normally chinch bugs are not a big deal until August in irrigated areas. It is so dry now it may as well be August. Gophers have moved into my yard from the woods looking for water, taking down one shrub after another as they cut into the roots of everything I have planted in this yard. I don't see how any of this can survive when it starts to get hot (high 90's) with so much root damage.

    I know how it is for you HouTex, my fill water is TA 340 last I checked. Every time I add water the TA in the pool jumps measurably, 5 or 10 points.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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