Get fast, clear answers that help you choose the perfect Dolphin Pump for your aquarium, pond, or hydroponic system. Learn how to boost flow, efficiency, and performance.
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Choosing a pump depends on your total water volume and your specific goals (e.g., a reef tank requires more flow than a freshwater pond). As a general rule:
Aquariums: Aim for a "turnover rate" of 5x to 10x the total volume of your tank per hour. Ponds/Water Features: Aim to circulate the total volume at least once every hour.
Head pressure is the resistance the pump faces when pushing water vertically or through complex plumbing. If your pump has to push water up 4 feet, it will move less water than if it were pumping at 0 feet. Always check the Flow Curve Chart for your specific Dolphin model to ensure it meets your GPH (Gallons Per Hour) needs at your specific height.
Yes — you can safely restrict the discharge (outlet) side of a Dolphin Pump using a ball valve to fine‑tune the flow. Doing so reduces output, lowers energy consumption, and also changes the pump’s service factor because the motor is operating under a different load. However, you should never restrict the intake (inlet) side, as this can cause cavitation, overheating, and serious pump damage.
To find the minimum GPH (Gallons Per Hour) you need, use the following formula based on your desired Turnover Rate:
Total System Volume (Gallons) × Desired Turnovers Per Hour = Required GPH
Example (100 Gallon Tank):
System Type – System Volume x Desired Turnover = GPH
Freshwater / Fish - 100 Gallon x (5x per hour) = 500 GPH
Reef / Saltwater - 100 Gallon x (10x - 20x per hour) = 1,000 - 2,000 GPH
Ponds - 100 Gallon x (1x - 2x per hour) = 100 - 200 GPH
Note: When calculating your "Total System Volume," remember to include the water in your sump, equipment demands, and plumbing!
Yes. Our pumps are built with durable materials suitable for outdoor environments, including ponds, water gardens, and aquaculture systems. Always protect the motor from direct rain and snow exposure. Raise pumps above any suspected flood lines.
With proper installation and maintenance, Dolphin Pumps are known for exceptional longevity, lasting many years in continuous‑duty environments. We have customers with 20-year-old pumps!
Absolutely. Dolphin Pumps are engineered for continuous, reliable operation, making them ideal for aquariums, koi ponds, water features, and hydroponic grow systems that require strong, stable flow
Yes. Our pumps are designed for continuous duty and can run 24/7 when installed correctly and maintained properly.
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