How to calculate how many gallons in the pool

[phoenixtx]

I have a very uniquely shaped pool. This is a survey of what the shape of my pool is.

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I have an original work order for the building of the pool (2007 - I am not the original owner of the home, moved in after the fact) These dimensions are listed for the pool:
- pool size: 18-28 ; Per Ft: 77 ; SA: 400 ; Depth 3-6'. There is no listin gon this same document as to how many gallons this pool is.

Any guesses or ideas how I can figure out how many gallons this pool is?

 

[Richard320]

We need more dimensions. Depth of spa, depth of seat in spa, where the pool is deepest, etc.

 

[msgtdan]

Take a read of this thread it has some good suggestions. http://www.troublefreepool.com/estimating-a-free-form-pool-volume-t11772.html

 

[phoenixtx]

Okay, lets see if this provides a bit more info.

The total depth of the spa is ~3ft, with a 12" wide seat all the way around thats probably 18" tall.

The new image shows a line, everything to the right of the line is 3ft-ish then from the line is gradually goes down to 6ft at its deepest.

 

[Bama Rambler]

What is the longest dimension of the pool?
What is the widest dimension of the pool?
What is the diameter of the spa?

 

[phoenixtx]

The longest dimensions is 28 ft, the widest width is 18 ft

the spa is 7 ft wide

below is the only info listed on an original spec sheet of the pool
pool size: 18-28 ; Per Ft: 77 ; SA: 400 ; Depth 3-6'

 

[Bama Rambler]

I get about 10,000 gallons for both.

 

[jblizzle]

That is about what I get as well.

Start with that and use poolcalculator to calculate the effects of how much chemicals you add. If you are consistently under or over dosing, then you will know to adjust the volume a bit. Know the exact volume is not all the important if you test, dose and re-test as we suggest.

 

[phoenixtx]

10k gallons, thats not big at all. I know I have a smaller sized pool but that doesnt seem that big at all. Would you mind giving me a synopsis as to how you came to that number?

 

[jblizzle]

I used the bottom of poolcalculator.com: oval pool 16' x 28' x 3.5'

Like I said, it really does not have to be exact and you can get a better idea by looking at historical chemical additions and measure their effects.

 

[phoenixtx]

Thanks guys I really do appreciate the help. This whole time i've been going on a 13k gal pool assumption. I've only started trying to do the chemicals myself in the last week so I havent done much. I had a service before and never thought to ask them how many gallons they thought it was.

 

[Bama Rambler]

I do a down and dirty model of the pool in autocad based on the measurements you give and some guestimations and come up with a size.

Don't be surprised that your pool isn't as big as you thought it was. They almost never are. PB's tend to exaggerate pool sizes. I'd really be surprised if yours makes 10,000 gallons.

As JB mentioned, using a good test kit you can test and add a known amount of a chem and test again in 30 minutes and adjust the size in the pool calc until you get consistent at hitting the target you shoot for.