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Thread: Brand New 18' x 48" Intex Ultra Frame

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    Brand New 18' x 48" Intex Ultra Frame

    Just set up a brand new Intex Ultra Frame 18' x 48" AG pool w/ fresh fill 2 days ago (roughly 6500 gal). Tested fill water using a hth 6-way test kit from wal-mart and got the following results:

    pH: 8
    FC: 0
    TA: 270
    CH: 0
    CYA: 0

    So... based on what I read in pool school and calculated in the pool calculator(I'll admit I may have skimmed too quickly), I know that I need to lower my pH, lower my TA, increase everything else. On first night, I added 8oz of 31.45% muriatic acid, which would lower pH to ~7.8. After running pump for about an hour, I also added ~12oz of dichloro powder, hoping to lower my pH some more while increasing TC and CYA. On second night (no new test), I added another ~12 oz of dichloro powder (with the intention of doing this for 4 nights as recommended in the temporary pool section of pool school). Today (3rd day) I tested everything again and got the following:

    pH: 7.8
    FC: 0.5-1
    TA: 200
    CH: 0
    CYA: 0

    Am I approaching this wrong? Should I focus on lowering pH to ~7 with muriatic acid FIRST before trying to get my CYA/TC up?

    I should probably mention that the water was a little murky (local water) before adding anything; it is currently crystal clear blue but has a pungent chemical smell.
    ~6.5k gal, AG 18' x 48" Intex Ultra Frame, Krystal Klear 1500 gph, installed/filled 6/30/2013

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    Mod Squad jblizzle's Avatar
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    Re: Brand New 18' x 48" Intex Ultra Frame

    Welcome to TFP!!!

    With the low CYA, the FC will be lost to the sun quickly.

    The 12oz of dichlor would have added 7.7ppm of FC and 7ppm of CYA ... doing this twice now would only have raised the CYA up to 14ppm which is still below the minimum of the test.

    The pH is fine for now continue what you are doing for 2 more days and then you CYA should be measurable and then you can lower the pH some more if needed (the high TA is contributing to the pH not dropping very fast).

    If you find the FC is near 0ppm, soon after adding the dichlor, use some bleach to keep the FC around 2ppm.
    Jason, TFP Moderator
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    Re: Brand New 18' x 48" Intex Ultra Frame

    Ok thanks. Yeah I didn't think to realize the test only measures CYA down to 30 ppm. Also, I figured out the smell is actually from some of the reagents in the test kit itself and not my water.

    So I'll keep adding the dichlor for 2 more days then use liquid chlorine once my CYA level is good. I have been running my pump for 8 hours after adding dichlor; will this be sufficient on a daily basis in the evening? Also, the return jet is pointed upwards and is breaking the level of the water, will this be sufficient aeration to eventually lower my TA level? Should I worry about CH last? What's the optimal CH level for this pool?
    ~6.5k gal, AG 18' x 48" Intex Ultra Frame, Krystal Klear 1500 gph, installed/filled 6/30/2013

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    Mod Squad jblizzle's Avatar
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    Re: Brand New 18' x 48" Intex Ultra Frame

    The chemicals only need about 1 hours of pump run time to mix. The amount you run the pump is up to you: pool-school/pump_run_time

    Breaking the surface will cause aeration and that will just raise the pH, it will not lower the TA: pool-school/lowering%20total%20alkalinity

    CH does not matter at all in vinyl pools ... so you can likely just ignore it.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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