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Choose a filter or pump flow rate by deciding how many times per hour the full tank volume should turn over. Rule of thumb: 3–5×/h for community freshwater tanks, 3–10×/h for planted tanks, and 8–10×/h for reef tanks.
Freshwater 3–5×, planted 3–10×, reef 8–10×
Enter your tank volume and target turnover, then press Calculate.
Rated flow on the box is measured without media and with no pipe run. Reduce it by 20–40% for real-world conditions. Bettas and other slow-water fish prefer gentle flow — use a spray bar or diffuser.