# Mystery Pool Capacity

#### revitup

Bronze Supporter
I've just had a new IG pool installed. It is a Carribean Bay "Calypso" model. I have been trying to find out the gallon capacity for a while now. The pool installer says 14000 gal. Various other sources have said 10000 and 12000. None of these seem to provide accurate chemical amounts for calculations in any of the various apps I've tried. The chemical amounts specified always seem excessive, having to be halved or even quartered to provide the correct result. My rough measurement of the irregular shaped pool is closer to 8000 gallons. Is there anyone else that has this model pool? Do you know the capacity? Is there a number which works in your calculations?

#### RMcGirr83

Gold Supporter
Avg width x Avg Length x Avg Depth x 7.5 = Gallons. Our PB was off by 5000 but ours is also a gunite pool not fiberglass.

#### mknauss

TFP Expert
Bronze Supporter
Contact the pool manufacturer and get a drawing with total volume. That will be to the top of the flange. Subtract 6” of pool volume and you should be pretty accurate.

Be sure you are using TFP Poolmath for chemistry adjustment.

#### revitup

Bronze Supporter
Manufacturers pool spec says this pool is 14'x30', depth 3'-6'. I measure closer to 13'x28.5' so 370.5sqftx4.5' avg depth is 1667.25cuftx7.48=12471gal. If I use that in my chem calculations it isn't even close.

#### kimkats

So lets dial in your size by gallons using your chemistry. With you saying your levels are changing different than what is expected then we need to dial it in.

FC or pH will be the two easiest to use. Start with a nice, even number like 8000. Test your FC and see where it is at right then. Use Pool Math with your pool size set at 8000 see how much chlorine to add to a 8000 gal pool to get it up 2 points. Add that amount with the pump on high. Wait about an hour and retest. What happened? Did it go up too much? too little? Adjust your pool gals by 1000 gals either way and do it again. Once you get consistent results at this new size then move your size by 500 gals. That should do it. You can dial it is closer over time.

Kim

#### mknauss

TFP Expert
Bronze Supporter
Manufacturers pool spec says this pool is 14'x30', depth 3'-6'. I measure closer to 13'x28.5'
Fiberglass pool manufacturers report measurements at the flange. They should have a drawing showing the a CAD print out of all the measurements. Typically needed when applying for the building permit to install the pool.

#### YippeeSkippy

I'm getting about 12,000 to 12,300 gallons using the classic pool math page size estimator.

#### revitup

Bronze Supporter
I have an email in the the manufacturer, waiting for a response. All that's required on the building permit here is a rectangular footprint on a plot plan and a side crossection showing depth.
Maddie, when I use 12000 in my calculations the chems shown to be added after results measured are way over target level.

#### YippeeSkippy

What are you using to test your water and results with?

#### revitup

Bronze Supporter
This is the PH adjustments I've made the last several times. Chem adds to bring it up or down and the resulting differences. Can the capacity be calculated from this?

#### kimkats

What are you using to test your water and results with?

#### YippeeSkippy

I'd go with either Muriatic Acid or fresh liquid chlorine. Have you used *our* PoolMath, found at the bottom of this page??

#### revitup

Bronze Supporter
I'm measuring with Taylor 2006C kit and a nice Apera PH tester. I have to admit I'm using the Pool Doctor app for calculations.

#### YippeeSkippy

Why don't you try it using our PoolMath and just your block comparitor pH tester from the Taylor kit.... see if you get better results. Fancy pH testers are only as good as their calibration.......

#### revitup

Bronze Supporter
Sorry, that's FC not PH in #10, but I'm sure you figured that out.

#### mknauss

TFP Expert
Bronze Supporter
This is the PH adjustments I've made the last several times. Chem adds to bring it up or down and the resulting differences. Can the capacity be calculated from this?
View attachment 123251
Use Poolmath. Not sure what that is you screenshot.
I am sure the manufacturer will have a more detailed plot plan. I have a San Juan pool and can get all the plans off their website.

#### revitup

Bronze Supporter
What I showed in #10 is how much chem I added and what the result was. For instance the first line:
added 2.5 oz sodium thiosulfate, the FC level lowered 2.0 PPM.

#### YippeeSkippy

Without knowing where it was beforehand, its kinda hard to extrapolate where you ended up....

#### revitup

Bronze Supporter
Not sure why the raw measurements would make a difference but in my example in #17, the FC tested at 7.5ppm. I added 2.5oz sodium thiosulfate which resulted in a FC level of 5.5ppm.