Vindication :)

sbcpool

Well-known member
Mar 10, 2015
724
Upland, CA
I have always estimated my pool volume to be 20,000 gallons based on measuring the results of chemical additions, like CYA or salt. The pool builder was certain it was 30,000 from looking at it. Since it's a totally irregular shape (sides and bottom) I had no way to directly measure it ... until today. I just finished filling to pool and the water meter reads 21,580 gallons. Subtract my home's average daily usage and you get ~21,450 gallons.

Sorry if it's not an informative post, but after 7 years of wondering if I was right it felt good to know I was within 7%.
 

pjt

Gold Supporter
Jan 7, 2012
868
The Woodlands, TX
Pool Size
21000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
You would think every pool contractor would tell their customers to check their meters before and after the initial fill. It's free, easy, and provides very valuable information that's otherwise almost impossible to obtain.
 
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Newdude

Mod Squad
Gold Supporter
TFP Guide
Jun 16, 2019
18,132
NY
One day when you are bored, check this out. I found it for another member back when with a similar struggle. You can adjust the up/down arrows to make as many points as you need, then move them to the appropriate measurements for your surface area. Then You just have to figure out your average depth and account for rounded bottom corners, ledges, etc. Multiply it by 7.481 (?) gallons per cu ft and BOOM. Pretty dang close.
 
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PoolGate

Gold Supporter
TFP Guide
Jun 7, 2017
7,617
Damascus, MD
Pool Size
29000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Jandy Aquapure 1400
I did that with my first fill as well (water meter). My pool ended up being around 5k gallons more than contracted for since we changed the shape on the fly on the day of the dig. My neighbor's pool was overestimated by around 10k gallons. I did basic chemical additions to figure out his size for him.
 

Fpppool

Gold Supporter
Jan 3, 2019
89
Tx
Pool Size
20000
Surface
Plaster
Chlorine
Liquid Chlorine
I asked my county clerk for the documents submitted as part of the pool permit and voila... 20k gallons right there :)
 

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Nikilyn

Bronze Supporter
Sep 3, 2018
1,321
Gilbert, AZ
Pool Size
17000
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
You would think every pool contractor would tell their customers to check their meters before and after the initial fill. It's free, easy, and provides very valuable information that's otherwise almost impossible to obtain.
But then if it’s not as big as they were told the customer isn’t going to be happy and call them out on it and they can’t have that 🤪.
 

sbcpool

Well-known member
Mar 10, 2015
724
Upland, CA
One day when you are bored, check this out. I found it for another member back when with a similar struggle. You can adjust the up/down arrows to make as many points as you need, then move them to the appropriate measurements for your surface area. Then You just have to figure out your average depth and account for rounded bottom corners, ledges, etc. Multiply it by 7.481 (?) gallons per cu ft and BOOM. Pretty dang close.
The average depth part was what I couldn't figure out. The shallow end is very large and wide and the deep end is much more narrow and a sudden drop. Being more the mathematical type it wasn't too difficult to see that adding x amount of chemical had y result, which pointed towards 20,000 gallons. Not too far off from 21,500.
 
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Bill1974

Well-known member
Jun 18, 2014
251
Hauppauge, NY
Pool Size
32000
Surface
Vinyl
Chlorine
Liquid Chlorine
I have done the water meter test when the liner was replaced. I also did the math after measuring the water flow to figure out when it should be done filling (if i guessed the volume correctly). Prior to the liner change I had a guess (33k gallons), but chemical dosing and checking the levels made me change my initial guess to around 30K. Filling after the liner replacement confirmed the 30K. The Pool Math and Pool Pal apps make it pretty easy to pinpoint the volume.
 
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