# How Much Water in a 21 Foot Above Ground Pool

How Much Water in a 21 Foot Above Ground Pool?

If you are a proud owner of a 21-foot above ground pool, you may be wondering just how much water it requires to fill. The capacity of your pool depends on various factors, such as its shape, depth, and overall design. Let’s delve into the details to give you a better understanding.

The average depth of a 21-foot above ground pool typically ranges from 48 to 52 inches. To calculate the water capacity, you need to consider these dimensions. Assuming a conservative average depth of 50 inches, the volume of water required would be as follows:

Volume = Length x Width x Average Depth

The length of your pool is 21 feet, or 252 inches, and the width is typically 21 feet as well. Therefore, using the average depth of 50 inches, the calculation would be:

Volume = 252 x 252 x 50 = 3,780,000 cubic inches

To convert cubic inches to gallons, you need to divide the volume by 231 (since there are 231 cubic inches in a gallon):

3,780,000 / 231 = 16,363 gallons

So, a 21-foot above ground pool with an average depth of 50 inches would require approximately 16,363 gallons of water to fill.

Now, let’s address some common questions regarding pool water capacity:

1. How long does it take to fill a 21-foot above ground pool?
The time required to fill your pool depends on the water pressure and flow rate. On average, it can take around 8-12 hours.

2. How much does it cost to fill a 21-foot above ground pool?
The cost of filling your pool depends on the water rates in your area. On average, it can cost between \$50 to \$150.

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3. How often should I change the water in my pool?
The water should be changed every 3-5 years, depending on your pool maintenance routine and water quality.

4. Can I use well water to fill my pool?
Yes, well water can be used to fill a pool. However, it may contain minerals that can affect pH levels and pool chemistry.

5. How can I conserve water when filling my pool?
Using a pool cover can help reduce evaporation, and collecting rainwater can be used to fill or top up your pool.

6. How do I estimate the water level in my pool?
Most pools have a skimmer, which helps maintain the water level. It should be at the midpoint of the pool’s opening for optimal performance.

7. How often should I check the water level?
You should check the water level regularly, especially during hot weather or if you have an automatic pool cover that may lose water due to evaporation.

8. Can I use a hose to fill my pool?
Yes, a hose is commonly used to fill above ground pools. Make sure to monitor the filling process to prevent overflow.

9. How do I calculate water capacity for irregularly shaped pools?
For irregularly shaped pools, divide the pool into smaller sections of basic shapes, calculate each section’s volume, and sum them up.

10. Can I partially fill my pool?
Yes, if you only want to fill it partially, adjust the calculations accordingly.

11. How do I maintain the water level in my pool?
Regularly adding water to compensate for evaporation and splashing is necessary to maintain the optimal water level.