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Thread: One for the experts....on evaporation

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    Themacdadt's Avatar
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    One for the experts....on evaporation

    image.jpgimage.jpgI maintained my moms pool for 20 plus years. It was concrete then plaster. Very basic no extras.
    I never had to add water (due to evaporation). I would go six months or more never adding water.

    Sooooo. My current pool is concrete that looks like beach sand. Rock waterfall about ten feet wide and four feet tall. Built in spa with overflow of about a half inch.
    I did have leaks that are fixed now. I am currently loosing a inch and a half per week. I know everywhere says evaporation could be as much as a half inch daily. I don't believe this to be all my problem. Either I still have a small leak OR.......I believe that where my flagstone rocks of my waterfall are 2-3 inches below the water surface that water is being held and even climbing up to 3 inches up the flagstone. I say this because overnite with out the pumps running I can see wet rock 3 inches above the waterline and then dry rocks the rest of the way up.

    So I think the more porous, absorbing flagstone rocks are causing water to rise up the stone therefore causing extra evaporation off those rocks.

    So my question is...would this theory be correct? And would a coating of clear resign applied to the rocks below the water level and upwards of a inch or so keep the rocks from absorbing the water and causing it to rise and the evaporate? Or was my moms pool a fluke of nature? (UPWARDS OF SIX MONTHS OR MORE WITHOUT ADDING WATER.)

    Thanks.
    Last edited by Themacdadt; 05-10-2015 at 02:09 PM. Reason: Photo
    Thanks Todd.
    15,000 gal. In ground, sand textured with beach area, spa located in beach area with spillover equal to pool level.Rock waterfall with 4 foot drop.Hayward goldline aquaplus automation all wireless remote.T 15 cell,Propane heater,Super 2 for pool/spa,Super 2 for waterfall.Cartridge filter and solar panels.

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    Mod Squad tim5055's Avatar
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    Re: One for the experts....on evaporation

    First I would ask you to update your profile to include city/state, cit/province or even country. Advice we give is many times based on the locations involved. If mom's pool was in Portland, OR and yours is in Marathon, FL there may be a difference in evaporation between the two.

    Porous rocks may cause a wicking action, thus increasing evaporation.

    You could do two bucket tests, one with the pump running and one with it off to see if you have differences is evaporation.

    Set a bucket on one of your steps and fill to the water level so it matches inside and outside. After 24 hours if there is a difference in level between inside/outside you know something is happening. Usually the outside will drop faster than the inside if there is a leak and/or higher evaporation due to your rocks.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Mod Squad woodyp's Avatar
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    Re: One for the experts....on evaporation

    Could be a difference of shading between the two pools OR less wind blowing across hers.
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    Themacdadt's Avatar
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    Re: One for the experts....on evaporation

    We live 10 miles apart in cocoa fl. Pools facing same direction. Same exposure. Don't know why the pics are upside down but you can see what I'm talking about
    Thanks Todd.
    15,000 gal. In ground, sand textured with beach area, spa located in beach area with spillover equal to pool level.Rock waterfall with 4 foot drop.Hayward goldline aquaplus automation all wireless remote.T 15 cell,Propane heater,Super 2 for pool/spa,Super 2 for waterfall.Cartridge filter and solar panels.

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    Re: One for the experts....on evaporation

    Quote Originally Posted by Themacdadt View Post
    Don't know why the pics are upside down but you can see what I'm talking about
    iPhone pics? Apple products do that.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Themacdadt's Avatar
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    Re: One for the experts....on evaporation

    Quote Originally Posted by tim5055 View Post
    First I would ask you to update your profile to include city/state, cit/province or even country. Advice we give is many times based on the locations involved. If mom's pool was in Portland, OR and yours is in Marathon, FL there may be a difference in evaporation between the two.

    Porous rocks may cause a wicking action, thus increasing evaporation.

    You could do two bucket tests, one with the pump running and one with it off to see if you have differences is evaporation.

    Set a bucket on one of your steps and fill to the water level so it matches inside and outside. After 24 hours if there is a difference in level between inside/outside you know something is happening. Usually the outside will drop faster than the inside if there is a leak and/or higher evaporation due to your rocks.
    So what do you think about the resin ?
    Thanks Todd.
    15,000 gal. In ground, sand textured with beach area, spa located in beach area with spillover equal to pool level.Rock waterfall with 4 foot drop.Hayward goldline aquaplus automation all wireless remote.T 15 cell,Propane heater,Super 2 for pool/spa,Super 2 for waterfall.Cartridge filter and solar panels.

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    Re: One for the experts....on evaporation

    The resin will most likely fail to make much difference.

    Is there another reason to fix this other than the water loss? Your loss seems normal to me and what is abnormal is NO water loss. Your Mom's pool sounds completely abnormal to me......I'm not sure we have ever heard of that on the forum.
    Dave S.
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    Themacdadt's Avatar
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    Re: One for the experts....on evaporation

    Quote Originally Posted by duraleigh View Post
    The resin will most likely fail to make much difference.

    Is there another reason to fix this other than the water loss? Your loss seems normal to me and what is abnormal is NO water loss. Your Mom's pool sounds completely abnormal to me......I'm not sure we have ever heard of that on the forum.
    .

    Well, if I have to add a inch or two every week, how can I keep my numbers in range?
    I guess I'm just used to my moms maintance free pool, and assume that much loss of water means something's wrong.
    Thanks Todd.
    15,000 gal. In ground, sand textured with beach area, spa located in beach area with spillover equal to pool level.Rock waterfall with 4 foot drop.Hayward goldline aquaplus automation all wireless remote.T 15 cell,Propane heater,Super 2 for pool/spa,Super 2 for waterfall.Cartridge filter and solar panels.

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    Re: One for the experts....on evaporation

    The way you'll tell is if your salt numbers stay the same. Evaporation won't remove salt, but splashing will. If you're adding a lot of salt it's most likely a leak.
    11k IG polyurea lined gunite pool and spa, Pentair EasyTouch w/ IC20 SWG, 2 x Pentair 1.5HP Whisper, Pentair CC150, AquaCal Heat Pump

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    Re: One for the experts....on evaporation

    Monitor the salt level. I have a leak in my pool 600 gallons per month and have to add salt every 5 months. I also lose 3/4 inch per day through wind evaporation. The salt level will tell you the truth.

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    Re: One for the experts....on evaporation

    Your Mom's pool either has an autofill valve that you don't know about, or your Mom is sneaking out at night and filling the pool when you are not there.
    Cheers, Peter
    20,000 gal, 52'x17' kidney shaped IG, Pebble Tec, IntelliPro P6E6VS4H-209L pump. Intellichlor IC40 SWG.
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    Themacdadt's Avatar
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    Re: One for the experts....on evaporation

    Quote Originally Posted by prs View Post
    Your Mom's pool either has an autofill valve that you don't know about, or your Mom is sneaking out at night and filling the pool when you are not there.
    Definitely no auto fill. And she passed away. So she wasn't filing it.
    Thanks Todd.
    15,000 gal. In ground, sand textured with beach area, spa located in beach area with spillover equal to pool level.Rock waterfall with 4 foot drop.Hayward goldline aquaplus automation all wireless remote.T 15 cell,Propane heater,Super 2 for pool/spa,Super 2 for waterfall.Cartridge filter and solar panels.

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    Themacdadt's Avatar
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    Re: One for the experts....on evaporation

    Quote Originally Posted by tim5055 View Post
    First I would ask you to update your profile to include city/state, cit/province or even country. Advice we give is many times based on the locations involved. If mom's pool was in Portland, OR and yours is in Marathon, FL there may be a difference in evaporation between the two.

    Porous rocks may cause a wicking action, thus increasing evaporation.

    You could do two bucket tests, one with the pump running and one with it off to see if you have differences is evaporation.

    Set a bucket on one of your steps and fill to the water level so it matches inside and outside. After 24 hours if there is a difference in level between inside/outside you know something is happening. Usually the outside will drop faster than the inside if there is a leak and/or higher evaporation due to your rocks.
    What makes you believe the resign will fail? My theory is if the water can't be absorbed by the rocks there will be no wicking, or evaporating from a hot rock. I'm not saying I'm right, just looking for some science behind your oppinion that is greatly appreciated
    Thanks Todd.
    15,000 gal. In ground, sand textured with beach area, spa located in beach area with spillover equal to pool level.Rock waterfall with 4 foot drop.Hayward goldline aquaplus automation all wireless remote.T 15 cell,Propane heater,Super 2 for pool/spa,Super 2 for waterfall.Cartridge filter and solar panels.

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    Mod Squad tim5055's Avatar
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    Re: One for the experts....on evaporation

    Quote Originally Posted by Themacdadt View Post
    What makes you believe the resign will fail? My theory is if the water can't be absorbed by the rocks there will be no wicking, or evaporating from a hot rock. I'm not saying I'm right, just looking for some science behind your oppinion that is greatly appreciated
    I think you quoted the wrong person. I never said the resin would fail, but I do believe it will. I have no science to back it up, just a gut feeling.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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