How Long Does It Take To Fill A swimming pool?

Swimming pools are a great way to enjoy the summer, but they can also be a real pain in the butt when it comes time to clean them up and get ready for winter.

The most common question we get is how long does it take to fill a swimming pool with water. This article will answer that question as well as give you some other helpful tips on keeping your pool looking its best all year round. 

Calculating your swimming pool size

Above Ground vs. Below Ground Pools:

Above-ground pools are typically made from concrete and are placed directly on top of the ground. They tend to be more expensive than their below-ground counterparts but they provide more options for customization.

Below ground pools are usually constructed by digging down about 6 feet deep and then lining the walls with the rebar before pouring concrete over them. These types of pools are less expensive than above-ground pools because they require fewer materials and labor costs. However, they are not as customizable as above-ground pools.

To fill your pool with water, first, you need to calculate the size of your pool. The most common sizes used in swimming pools are 10′, 12′ and 20′. This is a good rule of thumb when it comes to calculating how long it will take to fill up your pool.

If you have an above-ground pool, you can use this formula to determine how much time it takes to fill up your pool:


An Area of the pool (square feet)

Time required to fill the pool (minutes)

If you have a below-ground pool, you must use this formula instead:


A Volume of the pool (cubic feet)

Time Required to fill the pool (hours)

The volume of your pool is determined by multiplying its width times its length times its depth. For example, if your pool has a width of 8 feet and a length of 16 feet, and a depth of 4 feet, then its volume would be 64 cubic feet or 0.64 m3.

The time required to fill your pool depends on the type of pump that you choose. If you decide to go with a submersible electric pump, it should only take around 15 minutes to completely drain out the pool.

However, if you decide to go with an open-air pump, which requires a hose to connect it to the faucet, it could take longer. You may want to consider purchasing a timer so that you don’t have to wait until the end of every day to fill up your pool!

Finding Pool Flow Rate

Once you know how big your pool is, it’s time to figure out how fast it needs to flow. In order to do this, you’ll need to find the flow rate of your pool.

You can measure the flow rate of your swimming pool using a flow meter. Once you’ve measured the flow rate of your existing pool, you can compare it to the flow rates listed on the label of your new pool liner.

You can also estimate the flow rate of your new pool by measuring the diameter of your pipe and dividing it by the number of gallons per minute that your pool uses.

For instance, if you’re planning on installing a 5″ PVC pipe, and your current pool uses 100 gallons of water per hour, then the flow rate of your pipe is equal to 50 gallons per hour.

This means that it will take approximately 2 hours to drain out all of the water from your pool.

Water pressure

Water pressure refers to the amount of force exerted by a liquid against any surface upon which it rests. Water pressure is measured in pounds per square inch (psi).

When you turn on your showerhead, you notice that there is a lot of water coming out at once. This is due to high water pressure. On the other hand, when you turn off the showerhead, you notice little water coming out at once; this is due to low water pressure.

When you install a swimming pool, you should make sure that the water pressure is sufficient for your pool.

To ensure that you have enough water pressure, you should follow these steps:

1. Check to see whether your local utility company provides water pressure tests.

2. Measure the water pressure in your home.

3. Compare the results of both measurements.

4. Make sure that the water pressure meets the minimum requirements set by your local building code.

5. Install a filter system in your pool to remove debris before they enter the pool.

6. Clean the skimmer basket regularly.

7. Keep the pool clean.

8. Maintain the filter system properly.

9. Do not use chlorine tablets or bleach to disinfect your pool.

10. Use a proper pH balance to maintain the right level of alkalinity.

Water Pressure and How it Affects Filling Speed

The water pressure affects the speed at which water enters your pool. When the water pressure is too low, it takes more time to fill the pool than when the water pressure is higher.

In general, the following factors affect the water pressure:

• The distance between your house and the nearest city water source.

• The size of the pipe used to bring water into your home.

• The age of the pipes.

• The type of valves installed along the pipe.

How long does it take to fill a pool?

It takes about 10 minutes to fill a 3,000-gallon pool with 1 psi of water pressure. If your pool has a larger volume, it may take longer.

It will also depend on the size and shape of your pool. For example, a rectangular-shaped pool may fill faster than a round-shaped one because it’s easier for the water to move around.

A pool pump typically has an output capacity between 1,500 and 2,500 cubic feet per hour. If you’re pumping water from a well, you’ll need at least one of. You may be able to get away with less if there isn’t too much pressure in the line.

If you are using a municipal supply, the pressure provided by the utility company can vary depending on where you live. In some areas, the pressure may be very weak, while in others, it might be strong.


The taken to fill up the pool depends on a lot of things. One of them is the size of your pool, it highly affects the time taken to fill up the pool. Make sure to read all the factors that can affect the time to fill up your pool. For more information on pools, you can visit and gain some insights on swimming pools here.

Happy swimming !!!

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