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Cartridge Filter Square-Foot Recommendation

Estimate minimum cartridge area from design flow and a selected loading rate.

Estimated result:
Planning estimate: Confirm equipment specifications, performance tables, warranties, local requirements, and site conditions before purchasing or changing equipment.

How This Calculator Works

Enter realistic values from your pool, equipment labels, utility bill, or written estimate. Change an assumption to see how it affects the result.

What Matters Most

This is a planning estimate based on flow divided by the selected design loading rate, then adjusted for debris.

Always confirm the chosen filter’s published flow rating, plumbing limits, pump curve, local code, and manufacturer sizing instructions. Larger area usually means longer time between cleanings.

Common Mistakes

  • Using advertised maximums instead of performance at actual operating conditions.
  • Ignoring plumbing, filter, heater, sanitizer, automation, or electrical limits.
  • Rounding inputs before the final result.
  • Treating a planning estimate as a substitute for manufacturer instructions.

Frequently Asked Questions

Should I use measured values?

Yes. Measured flow, watts, pressure, dimensions, and current pricing usually improve the estimate.

Is the largest option always best?

No. Equipment should meet the required range without violating minimum flow, maximum flow, velocity, electrical, space, or compatibility limits.

Pool Gal Pro Tip 💦

Write down the clean, working baseline when equipment is new. Future-you will look brilliant when troubleshooting season arrives.