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Thread: New Homeowner/Member - Calculating Pool Size?

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    New Homeowner/Member - Calculating Pool Size?

    Hi everyone, thanks for this forum, loads of information here. I got the TFT100 test kit so I have results to share and questions about those, but first I thought I should know the size of my pool. Previous owner doesn't really know (he guessed 35k-40k gallons). I'm including photos and measurements here in case there's some sort of calculation that can be done.

    Pool is 8.5 ft deep to the water line in the deep end. Tanning shelf on the shallow end next to the spa. Spa is 7 ft in diameter with a seat all the way around.


    IMAG0063.jpg

    IMAG0064.jpg
    ~26,000 gal (still dialing it in) / in-ground saltwater (Hayward T-CELL-15) / Blue Granite PebbleSheen / 2hp WhisperFlo pumps (main), 1.5hp WhisperFlo pump (waterfall) / Pentair DE filter / AquaLogic control / Polaris cleaner aka "Trackie" / Dallas, TX

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    BoDarville's Avatar
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    Re: New Homeowner/Member - Calculating Pool Size?

    Welcome to TFP!

    I would use the Pool Math tool ( http://www.troublefreepool.com/calc.html). Towards the bottom of the page is an area for estimating pool volume. You will need to enter two separate sets of dimensions for your pool and spa and then add the two volumes.

    Based on your pic, I would choose the "oval" option for the pool and then take the length/width dimensions and average out the pool depth (for example, if the shallowest part of your pool is 3.5 feet and the deep end is 8.5, average these two figures to get the depth).

    For the spa , choose the "round" option and enter the diameter of 7 feet. For the depth, measure the depth to the shallow part (seating area), then measure the depth to the floor of the spa. Average these two figures for the spa depth.

    BTW, congratulations on getting the TF100 . Will save you lots of $ by dosing only with the chemicals and amounts needed, not to mention the priceless aspect of a sparkling pool.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

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    Re: New Homeowner/Member - Calculating Pool Size?

    Thanks for linking to that tool BoDarville - very helpful (is that really you Burt Reynolds?) I calculated the following:

    Pool - 6.5 average depth (4.5 shallow end, 8.5 deep end), 17' wide, 36' long = 26,700 gal
    Spa: 7' diameter, 4' depth = 1,200 gal

    Total gal = 27,900

    Sound about right? I'll post another thread for the levels based on current test results.
    ~26,000 gal (still dialing it in) / in-ground saltwater (Hayward T-CELL-15) / Blue Granite PebbleSheen / 2hp WhisperFlo pumps (main), 1.5hp WhisperFlo pump (waterfall) / Pentair DE filter / AquaLogic control / Polaris cleaner aka "Trackie" / Dallas, TX

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    Richard320's Avatar
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    Re: New Homeowner/Member - Calculating Pool Size?

    Quote Originally Posted by muffin_dad View Post
    Thanks for linking to that tool BoDarville - very helpful (is that really you Burt Reynolds?) I calculated the following:

    Pool - 6.5 average depth (4.5 shallow end, 8.5 deep end), 17' wide, 36' long = 26,700 gal
    Spa: 7' diameter, 4' depth = 1,200 gal

    Total gal = 27,900

    Sound about right? I'll post another thread for the levels based on current test results.
    When you have accurate readings, pay close attention to what happens when you dose the pool. TA especially seems to work well for this. Be sure to wipe the tip of the R-009 so static electricity doesn't mess up the results. On http://www.troublefreepool.com/calc.html down near the bottom is Effects of Adding Chemicals. So let's say you need to lower pH and it tells you to add 30 oz of acid. Plug that in below and see what it says it will do to TA as well. Sometimes you can fudge a little and target a higher or lower pH to get TA to work out to a nice 10 ppm drop. Anyway, you do that and in a couple weeks you'll see that you're overshooting or undershooting, which will tell you the volume is higher or lower than you estimated. So adjust it up or down and see what happens over the next couple weeks. By Summer, you'll know within a couple hundred gallons how big your pool is, which will be close enough for dosing.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: New Homeowner/Member - Calculating Pool Size?

    Thanks Richard. Makes sense. As a type 1 diabetic for 30 years I have lots of practice doing this with my blood sugar, I figure the pool is just another thing to dose and measure, dose and measure, rinse and repeat...
    ~26,000 gal (still dialing it in) / in-ground saltwater (Hayward T-CELL-15) / Blue Granite PebbleSheen / 2hp WhisperFlo pumps (main), 1.5hp WhisperFlo pump (waterfall) / Pentair DE filter / AquaLogic control / Polaris cleaner aka "Trackie" / Dallas, TX

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    Divin Dave's Avatar
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    Re: New Homeowner/Member - Calculating Pool Size?

    Man that's a killer pool you have there! The landscaping rocks too.

    Is that some type of tall evergreen trees behind the diving board? If you dont mind sharing what type they are... those would worl perfect for a spot I have reserved for 'TBD'.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    Re: New Homeowner/Member - Calculating Pool Size?

    Thanks! Sold us on the house, along with a few other features. Since I didn't plant them I'm not 100% certain but they look like Italian Cypress to me.
    ~26,000 gal (still dialing it in) / in-ground saltwater (Hayward T-CELL-15) / Blue Granite PebbleSheen / 2hp WhisperFlo pumps (main), 1.5hp WhisperFlo pump (waterfall) / Pentair DE filter / AquaLogic control / Polaris cleaner aka "Trackie" / Dallas, TX

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    BoDarville's Avatar
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    Re: New Homeowner/Member - Calculating Pool Size?

    ...I'm not 100% certain but they look like Italian Cypress to me.
    Looks like Italian Cypress to me as well. I have five of them planted in our yard as a screen. Evergreen and very "clean" plants in that they don't drop debris into the pool.

    BTW, your volume calculations look good to me. I recently re-ran my pool dimensions through the PoolMath tool (had calculated volume using another tool before I found TFP). Just updated my sig with the new volume which seems closer to actual.

    Richard320 brings up a good point about paying close attention to what happens when you dose the pool after making the initial volume calculation. This will serve as a sanity-check on the volume measurement. In fact, this is what lead me to remeasure my pool's volume. Even though my water chemistry numbers were kept within the recommended ranges, it seemed that I needed to use a slightly higher dose to get/keep them there.

    Over the next several dosing sessions, I would take measurements about one hour after dosing (with pump on) and see if the water chemistry numbers changed to what you were expecting based on your dosage amount. If the change is a bit less than you were expecting, then you are undershooting which indicates your pool volume is slightly higher than your estimate. If that's the case, increase your dosage slightly and record the amount. If the opposite situation occurs, decrease the dosage and retest. All of this assumes your pool chems are fresh and at the labeled potency. If there is any doubt, start with fresh chems. When you reach the point where your dosage amount has the expected impact on your water chemistry, you will have fine-tuned your pool water volume measurement.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

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    pwrstrk's Avatar
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    Re: New Homeowner/Member - Calculating Pool Size?

    Welcome to TFP and congrats to the new home that beautiful pool ! 😎
    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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    Isaac-1's Avatar
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    Re: New Homeowner/Member - Calculating Pool Size?

    Like the others said congrats, I love the look of the pool
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
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