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Thread: Excessive evaporation, I think

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    Excessive evaporation, I think

    Here in Miami I mentioned to my brother that I have to refill my pool quite frequently. My pool receives direct sun from 11am or so till 3pm. He tells me that he doesn't fill it that often and the level remains constant; his pool receives direct sun all day.

    I dont have measurements of the water level but will collect them once the pool is done filling up today. At present I'm simply going by comparison to what he tells me, and I don't have any cracks along any walls or the floor.

    Aside from leaks from the buried pvc pipes that I cant see, can water be leaking from somewhere else? I will update this post with a measurement of water loss in a few days.
    16,900 gallon inground pool (16x30 with spa bench)
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    JasonLion's Avatar
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    Re: Excessive evaporation, I think

    There are many many places the pool can leak.

    In Miami during the summer there should be lots of humidity and hardly any evaporation. In the spring and fall it is sometimes less humid, and you will get some evaporation at that time. 1/4" of evaporation per day would be about the extreme upper limit of how much evaporation you could have on a windy day with near zero humidity.

    One good double check is the bucket test. Put a bucket of water in the pool and match the water level in the pool to the water level in the bucket. Then see if they both go down at the same rate (evaporation) or the pool goes down more quickly (leak).
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    pwrstrk's Avatar
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    Re: Excessive evaporation, I think

    Have you taken a look at this article from Pool School. http://www.troublefreepool.com/conte...leak-detection.
    The bucket test should be able to confirm evaporation or a leak somewhere.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: Excessive evaporation, I think

    +1 What JasonLion posted. 1/4" daily or less is normal. More than that and you have a leak.

    Start looking for the leak once you have determined you have one.
    Dave S.
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    Divin Dave's Avatar
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    Re: Excessive evaporation, I think

    +1 for bucket test
    Divin Dave,
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    Re: Excessive evaporation, I think

    I'm just north of you in Lauderdale. Bought my house in July. Since then, I've added a little water just twice. Otherwise, rainfall kept up with evaporation just fine.
    15k in-ground plaster, Hayward C900 cartridge, 3/4hp single speed pump, Barracuda G2 cleaner, TF-100

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    Re: Excessive evaporation, I think

    Yes, in summer months, the rains take care of the the water line. I will do the bucket test....Thank you
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    Re: Excessive evaporation, I think

    Ok, some numbers.
    I filled it up on Sunday, and we've had glorious, gorgeous sunny days. This morning, the pool water is down almost an inch and a half. I put in a bucket yesterday morning, and today it is down about 1/8".
    I'm leaning towards the fact that i have a leak somewhere. Great. How do I go about locating it? Or is it not worth digging up my entire backyard to find a leaky pvc joint or pipe?
    16,900 gallon inground pool (16x30 with spa bench)
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    Re: Excessive evaporation, I think

    Your results are confusing. I read your post to say you lost 1.5 inches from Sunday to Wednesday. (3/8 inch daily) and This last 24 hours (thereabouts) you lost 1/8".

    1/8 inch daily would be within the realm of reasonable but 3/8 inch daily would be a little excessive and I would suspect a leak.

    I would not chase water loss of 1/8" daily but I would 3/8 daily.
    Dave S.
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    Re: Excessive evaporation, I think

    Quote Originally Posted by duraleigh View Post
    Your results are confusing. I read your post to say you lost 1.5 inches from Sunday to Wednesday. (3/8 inch daily) and This last 24 hours (thereabouts) you lost 1/8".

    1/8 inch daily would be within the realm of reasonable but 3/8 inch daily would be a little excessive and I would suspect a leak.

    I would not chase water loss of 1/8" daily but I would 3/8 daily.

    duraleigh--thank you
    The 1/8" loss was in the bucket test. The 3/8" daily loss is in the actual pool. How do I chase that? If I don't see water leaking near the pump or filter, then the leak must be in the pipes somewhere. How do i locate a leak in pipes that are hidden below pavers, grass, etc? I know..a pain.
    16,900 gallon inground pool (16x30 with spa bench)
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    Re: Excessive evaporation, I think

    Are you saying that the bucket lost 1/8" and, in the same time period, your pool lost roughly 3/8"?
    Dave S.
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    Re: Excessive evaporation, I think

    Quote Originally Posted by duraleigh View Post
    Are you saying that the bucket lost 1/8" and, in the same time period, your pool lost roughly 3/8"?
    Yes, sort of.
    The bucket test began yesterday morning, after reading the posts above, and the pool test began Sunday afternoon when I last filled it to a tile line.
    16,900 gallon inground pool (16x30 with spa bench)
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    Diamondbrite surface, redone in 2017.
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    Re: Excessive evaporation, I think

    You are missing the point of the bucket test. The bucket test compares the loss in the bucket to the loss in the pool over the EXACT same time period. If the pool loses more than the bucket (bucket should be placed VERY near the pool water, like on the steps), you can be pretty assured you have a leak.

    Regardless, It sounds like you have a leak. Do not assume it is in the underground pipes........it usually isn't.

    Don't start digging until you exhaust all other possibilities.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Excessive evaporation, I think

    Quote Originally Posted by duraleigh View Post
    You are missing the point of the bucket test. The bucket test compares the loss in the bucket to the loss in the pool over the EXACT same time period. If the pool loses more than the bucket (bucket should be placed VERY near the pool water, like on the steps), you can be pretty assured you have a leak.

    Regardless, It sounds like you have a leak. Do not assume it is in the underground pipes........it usually isn't.

    Don't start digging until you exhaust all other possibilities.
    dalegh..I understand the bucket test. I simply reported the numbers I have so far. I will measure the bucket loss after 3 days. If it isn't the pipes, where else coukd it be happening? The underwater light perhaps? I don't have any cracks in the walls.
    16,900 gallon inground pool (16x30 with spa bench)
    Sta-rite cartridge filter
    Diamondbrite surface, redone in 2017.
    1.5hp Hayward Super Pump
    Hayward Navigator Pro suction cleaner with V-flex kit

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    Re: Excessive evaporation, I think

    Lower the water to below the skimmer and test again. Skimmer leaks are common.
    36' x 18' 20k in ground, Finest Finish grey plaster, Pentair Tagelus 100D sand filter, Hayward Northstar 2hp pump, Jandy LRZ125EN heater, spill over spa, iaqualink controlled automation, Stenner chlorination, natural rock and flagstone coping, 1" glass mosaic waterline tile, SR Smith Vortex slide.

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    Re: Excessive evaporation, I think

    Quote Originally Posted by smracing View Post
    Lower the water to below the skimmer and test again. Skimmer leaks are common.
    the water is below the skimmer. This is the dry season here in Miami.
    16,900 gallon inground pool (16x30 with spa bench)
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    Re: Excessive evaporation, I think

    Couple quick things. When pool is full and pump running are you seeing any bubbles in your pump pot? Does it prime up quickly? You say it's "below" the skimmer(s) right now, but is it PAST the very bottom the skimmer box? I would recommend shutting down system (pull trippers on timers - disable computer timer, etc) shock up the pool and pull your return jets (inlets) and pressure side auto cleaner (if you have one) and plugging off all theses ports with rubber plugs - typically #10's or #8's depending on your wall fittings. DO NOT FILL IT UP AGAIN JUST YET. Check your loss at 24/48hrs and see what YA got, bucket AND pool. If it, pool, doesn't drop, fill it back to normal level and give it 24/48 hr again to see if it drops. If it does then more than likely you've got a leak / separation on your skimmer box(s). If you fill it up, leave all inlets plugged and it does not leak you probably have a pressure side leak on pipe, fitting or wall fitting. Good luck.
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    Re: Excessive evaporation, I think

    Quote Originally Posted by Cpc View Post
    Couple quick things. When pool is full and pump running are you seeing any bubbles in your pump pot? Does it prime up quickly? You say it's "below" the skimmer(s) right now, but is it PAST the very bottom the skimmer box? I would recommend shutting down system (pull trippers on timers - disable computer timer, etc) shock up the pool and pull your return jets (inlets) and pressure side auto cleaner (if you have one) and plugging off all theses ports with rubber plugs - typically #10's or #8's depending on your wall fittings. DO NOT FILL IT UP AGAIN JUST YET. Check your loss at 24/48hrs and see what YA got, bucket AND pool. If it, pool, doesn't drop, fill it back to normal level and give it 24/48 hr again to see if it drops. If it does then more than likely you've got a leak / separation on your skimmer box(s). If you fill it up, leave all inlets plugged and it does not leak you probably have a pressure side leak on pipe, fitting or wall fitting. Good luck.
    thank you CPC.
    Yes, I see bubbles come out of ONE of the 2 return jets and also in the pump pot. I don't know what quick priming is, but after turning on the pump, a lot of bubbles and a filling noise come out of the one return jet. At present, the water is below the entry of the skimmer door, but not below the box itself; I make sure there is always water in there (by hand).
    I like your thought process. What plug would I use for the suction line? Or can I rely on the little door it has?
    16,900 gallon inground pool (16x30 with spa bench)
    Sta-rite cartridge filter
    Diamondbrite surface, redone in 2017.
    1.5hp Hayward Super Pump
    Hayward Navigator Pro suction cleaner with V-flex kit

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