Filter High Pressure
Fix high pressure problems and maintain proper filtration
High Pressure Indicators
📈 Pressure Signs
- • Gauge reading 8-10 PSI above normal
- • Reduced water flow from returns
- • Difficulty maintaining clear water
- • Pump working harder than usual
⚠️ Common Causes
- • Dirty filter needs backwashing
- • Filter media needs deep cleaning
- • Closed or restricted valves
- • Pump too large for filter
Quick Answer
High filter pressure typically means the filter is dirty and needs cleaning. When pressure rises 8-10 PSI above the clean starting pressure, it's time to backwash (sand/DE filters) or clean cartridge filters. High pressure reduces flow and filtration efficiency. Check that return valves are fully open. If pressure remains high after cleaning, filter media may need deep cleaning or replacement.
Understanding Pool Filter Pressure
Normal Pressure Ranges
What Causes Pressure Rise?
- • Debris accumulation: Dirt, oils, and particles trapped in filter
- • Calcium scale: Hard water deposits on filter media
- • Algae growth: Dead algae clogs filter quickly
- • Body oils/sunscreen: Creates film on filter media
- • Fine particles: Silt and dust that embeds in media
Important:
Always note your "clean starting pressure" after backwashing or cleaning. This baseline is essential for knowing when to clean your filter. Write it on the filter or equipment pad.
High Pressure Troubleshooting Steps
Step-by-Step Diagnosis
Check Pressure Gauge Reading
Verify gauge accuracy and note pressure increase from clean starting pressure.
⚠️ Warning: Replace faulty gauges - incorrect readings lead to filter damage
Inspect Return Flow
Check if water flow from returns has decreased despite high pressure.
Verify Valve Positions
Ensure all return side valves are fully open. Check for partially closed valves.
⚠️ Warning: Never close return valves completely while pump is running
Backwash or Clean Filter
Perform appropriate cleaning based on filter type (sand, DE, or cartridge).
⚠️ Warning: Follow proper backwash procedures to avoid media loss or damage
Check for System Restrictions
Look for blocked returns, solar systems, or other flow restrictions.
Inspect Filter Media Condition
Evaluate if filter media needs deep cleaning or replacement.
⚠️ Warning: Old or damaged media cannot be restored by backwashing alone
Filter Types & Cleaning Methods
Sand Filters
Backwash Procedure:
- 1. Turn off pump
- 2. Turn valve to "Backwash" position
- 3. Turn on pump for 2-3 minutes
- 4. Turn off pump
- 5. Turn valve to "Rinse" for 30 seconds
- 6. Return to "Filter" position
Deep Cleaning:
- • Use sand filter cleaner annually
- • Replace sand every 5-7 years
- • Check for channeling or calcification
- • Consider glass media upgrade
DE (Diatomaceous Earth) Filters
Backwash Procedure:
- 1. Turn off pump
- 2. Turn valve to "Backwash" position
- 3. Turn on pump for 1-2 minutes
- 4. Turn off pump
- 5. Add new DE through skimmer
- 6. Return to "Filter" position
Grid Cleaning:
- • Disassemble and clean grids annually
- • Soak in filter cleaner solution
- • Inspect for tears or damage
- • Replace torn grids immediately
Cartridge Filters
Cleaning Procedure:
- 1. Turn off pump and release pressure
- 2. Remove filter cartridge
- 3. Rinse with garden hose
- 4. Soak in filter cleaner if needed
- 5. Rinse thoroughly
- 6. Reinstall when clean
Maintenance Tips:
- • Clean every 3-4 weeks in season
- • Deep clean every 3 months
- • Replace every 1-2 years
- • Rotate between 2 cartridges
When High Pressure Becomes Dangerous
Danger Signs
- ⚠️Pressure over 30 PSI: Risk of filter damage or explosion
- ⚠️Bulging filter tank: Immediate shutdown required
- ⚠️Leaking at seals: Pressure exceeding design limits
- ⚠️Gauge maxed out: Actual pressure may be higher
Immediate Actions
- 1. Turn off pump immediately
- 2. Open air relief valve carefully
- 3. Check all return valves are open
- 4. Do not attempt to remove filter lid
- 5. Call professional if pressure won't drop
- 6. Stay clear of filter until safe
Filter Service & Repair Costs
High Pressure Resolution Costs
🔧 DIY Attempt
⚠️ Risks:
- • Improper backwashing can damage filter media
- • Missing underlying problems causing rapid pressure rise
- • Chemical exposure during filter cleaning
- • Back strain from handling heavy filter lids
👷 Professional Service
✅ Includes:
- • Complete filter inspection and diagnosis
- • Professional backwashing or cleaning
- • Filter media deep cleaning if needed
- • O-ring and seal replacement
- • Pressure gauge calibration or replacement
- • System optimization for proper flow
💰 Value Tip: CoOpPools offers transparent pricing with no hidden fees. Our worker-owned model means fair prices and invested service.
High Pressure Safety Warning
- •Never remove filter lid when system is under pressure
- •Always turn off pump and open air relief before servicing
- •High pressure can cause filter tanks to explode
- •Wear safety glasses when working near pressurized equipment
- •If pressure exceeds 30 PSI, shut down immediately
- •Stand clear of filter during startup in case of failure
Prevent High Filter Pressure
Prevention Tips
Regular Pressure Monitoring
Check filter pressure weekly and note clean starting pressure after backwash
Timely Backwashing
Backwash when pressure rises 8-10 PSI above clean starting pressure
Seasonal Deep Cleaning
Chemically clean filter media every 3-6 months for optimal performance
Maintain Water Chemistry
Balanced water prevents scale buildup and extends media life
Professional Annual Service
Have filter inspected, cleaned, and media condition evaluated yearly
🏊 Pro Tip: Regular professional maintenance prevents 90% of pool problems.Get your maintenance quote today
Need Professional Help?
Dealing with persistent high filter pressure? Our filtration specialists can diagnose the cause, professionally clean your filter, and optimize your system for proper flow and pressure. We service all filter types and provide maintenance programs to prevent pressure problems.
Mention "high filter pressure" when calling for faster service
Related Pool Problems
Related Pool Problems
Filter Low Pressure
Often RelatedOpposite problem indicating different issues
Cloudy Pool Water
Sometimes RelatedOften results from poor filtration
Poor Water Circulation
Sometimes RelatedRelated to filter pressure problems
💡 Did You Know? Pool problems often occur together.Filter High Pressure can lead to or be caused by these related issues. Understanding the connections helps prevent future problems.