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Pool Filter Cartridge Replacement Estimator

Evaluate cartridge age, pressure recovery, cleaning frequency, and physical damage.

Cartridge age (years)

Cleanings per season

Clean-start pressure when new (PSI)

Pressure immediately after latest cleaning (PSI)

Torn pleats, cracked end caps, or broken bands Weak flow returns quickly after cleaning Media remains oily, stiff, or deeply stained after proper cleaning

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

Replace physically damaged cartridges promptly because torn media can allow debris through and broken bands can collapse pleats.

Pressure that no longer returns near the established clean baseline, rapidly recurring restriction, stiff media, or ineffective cleaning can indicate exhausted cartridges or another system problem.

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.