**Formula Numbers**Sodium Bicarbonate (baking soda) - 71,400Sodium Carbonate (soda ash) - 113,200Sodium Sesquicarbonate (sesqui) - 80,000Muriatic Acid - 125,000Sulfuric Acid - 126,700Sodium Bisulfate - 47,000

You need to be a member of Pool Genius Network to add comments!

## Comments

I meant, perimeter squared divided by 18 x 7.5

Thought you might find another formula for calculating volumn of freakyfreeform pools interesting. This formula was to me by a CPO instructor about 15 yrs. ago. It will give you a starting point so that you can then "back into" the actual volumn. It works reasonably well, and again, is only a starting point.

Perimeter squared divided by 18.

For the most part, if you can get within 2,000 or even 5,000 gals. with the initial calculation, then it becomes simple to "back into" the volumn.

If 1.5 lbs. of bicarb raises TA at the rate of 10ppm. per 10,000 gal. then to raise a 22,000 gal. pool by 40ppm. could be expressed as: 1.5 x 4 x 2.2 = 13.2 lbs. bicarb required.

To "back into" the volumn, retest TA after 24 hrs. and simply reverse the formula

13.2 divided by (1.5 x 4) = 2.2 or 22,000 gal.

While not as accurate as your method, it is simple, teachable, and close enough for field work..

Thanks for your insightful post. I am encouraged by the face that the average PGN subscriber WANTS to learn more. Our debates are lively and respectful and that always means we have a great opportunity for knowledge to transfer from mind to mind. There have been a small, but growing, vocal minority that have been challenging the "democratically" decided rules of health and building departments. Science and engineering by democracy just does not work. We use the scientific method: Characterization, hypothesis, predictions, and experiments. In this way, we can either confirm or deny the hypothesis.

The endless "opinion debates" are coming to an end. It appears that through historical study, we are about to narrow in on the window (1950-1970) where we left science and started down the path of folklore and rule by committee.

Fortunately the basic principles of science only get better by the day and by today;s standards, keeping a pool clean is rather low-tech.'