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Thread: Rainwater harvesting and TA

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    Rainwater harvesting and TA

    I'm following Richards approach to CA scale and am harvesting rainwater. My first test after harvesting revealed a TA of 50 (down 40%). I'm curious as to others experience with rainwater harvesting, asphalt shingles, and the overall effect on TA. Based on the CYA and CH dilution my first harvest replaced 25-30% of the pool water (WOOOHOO).

    As always thanks for the help guys!
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
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    Smykowski's Avatar
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    Re: Rainwater harvesting and TA

    I use a kneehigh rubberbanded to the end of the tube to catch any grit from the roof. I also use corrugated tubing, which helps catch stuff along the way.

    As to chemical variations, catch some rainwater from the tube and test it. That will help you plan for the minor adjustments after it rains.
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    Re: Rainwater harvesting and TA

    That is an amazing amount of water to capture. Rain water has little of anything in it, so you should expect to see a reduction in everything including TA. That is a really impressive amount of reduction.
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    Re: Rainwater harvesting and TA

    It was a proper gully washer. The catchment coming off of the roof looks like a firehose ... 4 or 5 hours of that.
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
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    Re: Rainwater harvesting and TA

    I was surprised by the volume, the bigger surprise was the TA dropping more than the rest of the chemistry.

    I'll grab some water coming off the roof next time to see what the levels are.
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
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    Re: Rainwater harvesting and TA

    It will be little TA and CH. Pure rain water won't have either, anything that it does have will be from contact with surfaces and substances it encounters. When water evaporates, everything solid (dissolved or otherwise) is left behind.
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    Re: Rainwater harvesting and TA

    I wish I could get enough rain to make a significant difference in things.

    The shingle grit doesn't seem to mess with the chemistry or stain the plaster, but it is a bear to vacuum up.

    The TA could have dropped some because of the aeration the rainwater did to the pool. When the surface looks like it's boiling, you know that's got to count as aeration!
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    Re: Rainwater harvesting and TA

    So do I!

    However, at less than one inch for 2014 so far, it's a good thing I'm not counting on it.
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    Re: Rainwater harvesting and TA

    Got missed by the last set of small rain clouds in the Houston area. Looks like I may have to give in and use city water to bring the level up a wee bit. I hate adding CH...

    Richard, Does aeration actually impact TA? I was under the impression aeration moved the PH and acid moved TA and PH.

    HAPPY FRIDAY!!!!
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
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    Re: Rainwater harvesting and TA

    Quote Originally Posted by karmabiker View Post
    Got missed by the last set of small rain clouds in the Houston area. Looks like I may have to give in and use city water to bring the level up a wee bit. I hate adding CH...

    Richard, Does aeration actually impact TA? I was under the impression aeration moved the PH and acid moved TA and PH.

    HAPPY FRIDAY!!!!
    you are correct
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: Rainwater harvesting and TA

    Rainwater is rarely pure and rarely inert even before it hits the ground. Clouds form from vapor condensing around small particles in the atmosphere and as rain falls it collects even more particles that are suspended in the air. So technically, it can contain almost anything suspended in the atmosphere including pollen, mold spores, bacteria and smog which may even add to the chlorine demand. Sometimes I notice a larger FC drop after it rains.

    http://www.nasa.gov/centers/langley/.../Aerosols.html

    http://www.popsci.com/science/articl...on-and-climate
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    Re: Rainwater harvesting and TA

    Great article - thank you!
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
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    Re: Rainwater harvesting and TA

    Grrrrrr. Looks like I may have to add city water, Holding out till thursday and the skimmers are off ... main drain only. WE NEED RAIN. And I'm obsessed with my CSI.

    thanks for listening.

    back to your regularly scheduled programming.
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
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    Re: Rainwater harvesting and TA

    I would love to see pictures of how y'all are collecting this rainwater into your pools? <pretty pleaseeeeeeeee!>
    Yippee
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    Re: Rainwater harvesting and TA



    And the water level this morning...


    The radar ...


    Fingers crossed
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
    One cannot follow Islam and Christianity at the same time, nor can one follow pool store methods and TFP at the same time.
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    Re: Rainwater harvesting and TA

    It would seem that there is a large umbrella over my house. Lots of rain around ... just not here.


    grrrr
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
    One cannot follow Islam and Christianity at the same time, nor can one follow pool store methods and TFP at the same time.
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    Re: Rainwater harvesting and TA

    It seems there is hope for rain.

    Numbers pre rain:
    Ch 550
    TA 50
    Ph 7.5
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
    One cannot follow Islam and Christianity at the same time, nor can one follow pool store methods and TFP at the same time.
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    Re: Rainwater harvesting and TA

    Quote Originally Posted by karmabiker View Post
    I nearly hurt myself laughing when I saw this. Reading from the front of the thread, I had imagined diverters, plumbing, big cisterns to hold the water, and pumps to get it into the pool. That's a great setup, and about 500x simpler than what I had in mind.
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    Re: Rainwater harvesting and TA



    Glad I could put a smile on your Friday!

    I've got plans for a diverter and a removeable section that goes straight to the spa. It's a little lower priority than some other projects...

    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
    One cannot follow Islam and Christianity at the same time, nor can one follow pool store methods and TFP at the same time.
    Pool School -- Pool Math -- TF-Test Kit

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    Re: Rainwater harvesting and TA

    Finally some rain.

    The TA coming off the roof is probably 0 - It turned on the first drop

    The Ph is 7.2

    No real point in testing anything else, no CH no CL and no CYA unless something has gone horribly wrong in the atmosphere.
    TFP Moderator Chris V. ~16K Pool & Spa, 48NSF DE, IG Plaster Circa 2000, Intermatic PE653, Challenger pump with a 2 speed B2984, 20gal stenner chlorine injection, Houston, TX
    One cannot follow Islam and Christianity at the same time, nor can one follow pool store methods and TFP at the same time.
    Pool School -- Pool Math -- TF-Test Kit

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