Having a properly functioning pool pump is essential for keeping your inground pool clean, clear, and enjoyable all season long. But with so many pump options on the market, how do you know which model is right for your pool?
Choosing the perfect pool pump involves carefully calculating your pool’s specific needs in terms of flow rate, circulation power, and electricity usage. It also means selecting a reliable and efficient pump sized for your pool that will stand the test of time. Follow these 5 simple steps to find the ideal inground pool pump for your backyard oasis.
Step 1: Determine the Pool’s Flow Rate Needs
The most important factor in choosing a pool pump is confirming it can adequately meet your pool’s flow rate requirements. Flow rate refers to the volume of water (in gallons) that the pump can circulate within a certain time period, and is measured in gallons per minute (GPM).
To keep water clean and prevent algae growth, pool water should turnover completely at least once every 12 hours. This means the pump’s flow rate should circulate the total volume of water in the pool within a 12-hour timeframe. Here’s how to calculate the needed flow rate:
Pool Volume (gallons) / Turnover Time (hours) = Flow Rate Needed (GPM)
For example, let’s say you have a standard 15,000 gallon inground pool. To find the needed flow rate, you would calculate:
15,000 gallons / 12 hours = 1,250 GPM
Therefore, you would need a pump capable of at least 1,250 GPM to properly circulate the entire volume of this sample pool once every 12 hours. The bigger the pool, the higher the flow rate needed.
It’s important to note that the plumbing size also impacts flow rate. Larger diameter piping allows water to move faster, while smaller pipes create more resistance. Consult with a pool professional to ensure your plumbing can handle the recommended flow rate.
Calculating Gallons and Flow Rate
- Explain gallons, turnover rate, and flow rate (GPM)
- Give equation for calculating needed flow rate
- Show example calculation for sample pool
Factor in Plumbing Size
- Note flow rate depends on plumbing pipe size
- Recommend consulting pool professional
Step 2: Calculate Total Dynamic Head (TDH)
After determining the necessary flow rate, the next step is calculating your pool’s total dynamic head (TDH). TDH measures the amount of resistance, or “head pressure,” that exists in your pool’s plumbing system. All of the twists, turns, elbows, and length of piping in your system add up to your pool’s total dynamic head.
TDH is measured in terms of feet. Most inground pools have a TDH ranging anywhere from 30 to 70 feet. Older pools may have a lower TDH, while newer pools with more sophisticated plumbing systems often have a higher TDH. The only way to get an accurate TDH measurement for your specific pool is to have a pool professional perform a manual calculation.
Defining Total Dynamic Head
- Explain what TDH measures (system resistance)
- Note TDH varies by pool and is measured in feet
Determining Your Pool’s TDH
- Discuss means of measuring TDH
- Provide general TDH ranges for typical inground pools
- Emphasize consulting a pool pro for exact TDH
Step 3: Choose Ideal Horsepower Size
Horsepower (HP) indicates the mechanical power of the pump motor. Matching the horsepower to your pool’s specifications ensures the pump can efficiently meet flow rate needs given the total dynamic head resistance in your plumbing system.
Choosing too small of a pump will mean it has to work too hard and struggle to keep up. On the other hand, an oversized pump with higher horsepower than required will be needlessly expensive to operate. For inground pools, a 1 to 2 HP pump is usually recommended.
Factors like pool size, plumbing size, flow rate needs, and TDH all impact the ideal horsepower size. As a general rule of thumb, pools up to 15,000 gallons typically require 1 to 1.5 HP. Larger pools from 15,000 to 25,000 gallons normally call for 1.5 to 2 HP pumps. Consulting a pool professional is the best way to dial in the perfect horsepower for your specific pool.
Horsepower and Pump Performance
- Explain relationship between horsepower and pump power
- Caution against under or oversized horsepower
Recommended Horsepower Range
- Give ideal HP range for inground pools
- Specify factors that affect needed HP
Step 4: Determine Appropriate Voltage
In addition to horsepower, choosing the right voltage based on your pool’s electrical system is also crucial for proper pump operation and energy efficiency.
The two most common voltage options are 115V and 230V. 115V is the typical household voltage, while 230V circuits are often used for large appliances like pool pumps. Some pumps also accommodate both voltages.
230V pumps are generally recommended because they provide better energy efficiency, lower operating costs, and increased longevity compared to 115V models. However, if 230V power is not available at your pool’s location, a 115V pump is a suitable option.
Pump Voltage Options
- Overview common voltage options (115V vs 230V)
- Note voltage must match electrical system
Benefits of 230V Pumps
- Explain energy efficiency benefits of 230V
- Discuss scenarios where 230V is recommended
Step 5: Select Efficient and Durable Pump Model
Once you’ve determined the required flow rate, TDH, horsepower, and voltage, it’s time to pick out a specific pool pump model. Focus on finding a pump that is highly energy efficient, ultra-quiet, and built to last.
Top brands like Pentair and Hayward are leaders when it comes to reliable inground pool pumps. Look for models with ENERGY STAR certification to ensure optimal energy savings. Also check that the noise output fits within your comfort range based on where your pump is located.
Prioritize corrosion-resistant and weatherproof housing materials that can withstand harsh outdoor environments season after season. High-quality impellers, motors, mechanical seals, and drains also contribute to a pump’s longevity.
Take the time to understand all of the pump’s features, settings, and maintenance needs before making a final purchase. Investing in the right pump from the start will save you headaches and keep your pool crystal clear for years on end.
Brand Recommendations
- Suggest top brands known for reliability (ex. Pentair, Hayward)
Efficiency and Noise Considerations
- Emphasize ENERGY STAR models save electricity
- Note importance of low noise output
Choosing the perfect pool pump involves carefully calculating your pool’s flow rate needs, measuring total dynamic head, selecting ideal horsepower and voltage, and investing in an efficient and durable pump model. Take the time to get professional advice and understand your pool’s unique specifications.
By following these 5 steps and doing some research on top-rated pump models for inground pools, you can pick out the perfect pump to keep your backyard swimming oasis healthy and enjoyable for years to come. With a properly sized and energy efficient pump, you’ll be primed for many future seasons of poolside fun in the sun!
