Pool Filter Cleaning & Replacement: Complete Guide for Every Filter Type

Your pool filter does 80% of the work keeping your water clear. A dirty or failing filter is the number one cause of chronic water clarity problems, and most pool owners wait too long to clean or replace theirs. Understanding your filter type, cleaning schedule, and replacement timeline saves money, prevents equipment damage, and keeps your pool crystal clear.

Here's everything you need to know about pool filters — which type you have, how to maintain it, and when it's time for an upgrade.

The Three Types of Pool Filters

Sand Filters

How they work: Water pushes through a bed of special filter sand (#20 silica). Sand traps particles as water flows through, then clean water returns to the pool.

Filtration level: Catches particles 20-40 microns (decent but not the finest)

Popularity: Very common in DFW, especially in pools built before 2015

Lifespan: Sand media lasts 5-7 years. Tank lasts 15-25 years.

Cartridge Filters

How they work: Water flows through a pleated polyester cartridge element that traps particles in the fabric folds.

Filtration level: Catches particles 10-15 microns (excellent clarity)

Popularity: Increasingly popular, now the most recommended filter type for DFW residential pools

Lifespan: Cartridge elements last 1-3 years. Housing lasts 15-20 years.

DE (Diatomaceous Earth) Filters

How they work: Water flows through grids coated with DE powder (fossilized diatoms). The DE creates a microscopic filter coating.

Filtration level: Catches particles 3-5 microns (the finest filtration available)

Popularity: Less common in residential, more in high-end or commercial pools

Lifespan: DE grids last 5-8 years. Tank lasts 15-25 years.

How to Tell Which Filter You Have

Feature	Sand Filter	Cartridge Filter	DE Filter
Shape	Round, barrel-shaped	Tall cylinder or rectangular	Round, similar to sand
Backwash valve	Yes (multiport or push-pull)	No backwash valve	Yes (backwash valve + air relief)
Size	Large (24-36" diameter)	Medium (varies)	Large
Maintenance	Backwash	Remove and hose off cartridge	Backwash + add DE powder
Drain plug	Bottom drain for sand changes	Drain plug or band clamp	Bottom drain

Still not sure? Take a photo of your filter and bring it to our Northlake store — we'll identify it instantly and tell you exactly what maintenance it needs.

Sand Filter Maintenance

When to backwash

• When filter pressure rises 8-10 PSI above your clean starting pressure
• Record your clean pressure after a sand change or new install — this is your baseline
• Typical example: If clean pressure is 12 PSI, backwash at 20-22 PSI
• In Texas summer, this may be every 1-2 weeks during heavy use

How to backwash

1. Turn off the pump
2. Set multiport valve to "Backwash" (never move the valve with pump running)
3. Turn pump on and run for 2-3 minutes until sight glass runs clear
4. Turn pump off
5. Set valve to "Rinse" and run for 30 seconds
6. Turn pump off, set valve back to "Filter"
7. Turn pump on — note the new clean pressure

When to replace sand

• Every 5-7 years regardless of appearance
• If backwashing doesn't reduce pressure anymore
• If water clarity is chronically poor despite good chemistry
• If you see sand in the pool (broken lateral inside the filter)
• Sand channeling (water finds paths through the sand rather than filtering through all of it)

Sand replacement cost

• DIY: $50-$100 for sand + your time (heavy lifting)
• Professional: $200-$400 including sand, labor, and inspection of laterals and valve

Upgrade consideration

If your sand filter is due for a sand change, consider upgrading to a cartridge filter system instead. Cartridge filters provide finer filtration (10-15 microns vs 20-40), use no backwash water (saving hundreds of gallons per month), and require less frequent maintenance. We sell and install cartridge filter systems — contact us for an upgrade quote.

Cartridge Filter Maintenance

When to clean

• When filter pressure rises 8-10 PSI above clean baseline
• Typically every 2-4 weeks in Texas summer
• Monthly during spring and fall
• Every 6-8 weeks in winter (if pool is running)

How to clean a cartridge filter

1. Turn off the pump
2. Release air pressure via the air relief valve on top
3. Remove the filter lid or band clamp
4. Carefully remove the cartridge element(s)
5. Hose off with a garden hose nozzle — work from top to bottom, cleaning between each pleat
6. For deep cleaning, soak overnight in a cartridge cleaning solution
7. Inspect for tears, cracks, or crushed pleats
8. Reinstall, replace lid, and restart pump
9. Open air relief valve until water sprays, then close

Deep cleaning schedule

• Quick hose-off: Every 2-4 weeks
• Chemical soak: Every 3-6 months (use filter cleaner to remove oils, minerals, and organic buildup)
• This is critical in Texas — sunscreen, body oils, and mineral-rich water clog cartridge pleats faster

When to replace cartridge elements

• Every 1-3 years depending on use and maintenance
• If cleaning doesn't restore the filter to near-baseline pressure
• If pleats are crushed, torn, or permanently discolored
• If end caps are cracked or separating
• If the cartridge collapses when you try to clean it

Cartridge replacement cost

• DIY: $50-$200 per cartridge element depending on brand and size
• Professional install: $100-$300 including element, inspection, and O-ring replacement

We stock replacement cartridge elements for all major brands (Pentair, Hayward, Jandy, Pleatco) at our Northlake pool supply store and online shop.

Products that help

Cartridge filter cleaner dissolves oils, minerals, and organic matter that hosing alone won't remove. Professional-grade filter cleaner extends cartridge life significantly. Available at our store and online.

Filter cleaning attachment for garden hose makes cleaning faster and more effective. The angled nozzle gets deep between pleats. Available at our Northlake store.

DE Filter Maintenance

When to backwash and recharge

• When pressure rises 8-10 PSI above clean baseline
• After backwashing, add fresh DE powder through the skimmer
• Amount varies by filter size — check your filter manual
• Typical residential DE filter: 4-8 scoops of DE powder

Annual teardown

• Once per year, fully disassemble the filter
• Remove grids and hose them thoroughly
• Soak in filter cleaner to remove mineral buildup
• Inspect grids for tears or damage
• Reassemble and add fresh DE

When to replace DE grids

• Every 5-8 years
• If you see DE powder returning to the pool through the returns
• If grids have visible tears or holes
• If cleaning and recharging doesn't restore water clarity

Choosing the Right Filter for Your DFW Pool

For most residential pools in the DFW North area, we recommend cartridge filters for several reasons:

1. Better filtration (10-15 microns) means clearer water
2. No backwash water waste — important for water conservation in Texas
3. Quieter operation when paired with variable-speed pumps
4. Lower operating costs over time
5. Easier maintenance than DE filters
6. Better compatibility with salt chlorine generators

If you're considering a filter upgrade, we handle the full process: assessment, sizing, installation, and startup. Request a quote or call (469) 455-1054.

Filter Pressure: Your Most Important Number

Learn your filter's clean starting pressure. This single number tells you everything about your filter's health.

• Write it down after every filter clean or new install
• Normal operating range: 0-8 PSI above baseline
• Time to clean: 8-10 PSI above baseline
• Something is wrong: Pressure drops to 0 or never rises (pump/suction issue)
• Dangerous: Pressure exceeds 30 PSI — turn off pump and inspect immediately

A pressure gauge that's stuck, bouncing, or reading wrong should be replaced. We stock filter pressure gauges at our Northlake store — they're inexpensive but critical for monitoring filter health.

Professional Filter Service

Our weekly maintenance plans include filter monitoring at every visit. Our Basic ($210/mo) and Premium ($250/mo) plans include filter cleaning as part of regular service. We also offer:

• Filter cleaning service: $75-$150 (standalone)
• Sand change: $200-$400
• Cartridge replacement: $100-$300
• Filter system upgrade: $500-$2,000 (equipment + installation)
• DE teardown and recharge: $150-$250

Get your free quote or visit our store at 1611 Commons Cir Suite 100, Northlake, TX 76226.

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Simplified Pools carries replacement filters, cleaning supplies, and filter accessories for all major brands. Visit our Northlake store or shop online. Serving Northlake, Argyle, Flower Mound, Trophy Club, and all DFW North.