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Filtration and Circulation

A canonical guide to sand, cartridge, and DE filters; clean baseline pressure; backwashing; and cloudy-water filtration fixes.

Hub: Equipment · When to use: You need to understand why the filter matters, how to set a clean baseline, or how to troubleshoot poor circulation.
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Filtration and Circulation

Cloudy water often starts with flow, filter condition, or dirty media long before it becomes a chemistry emergency.

Baseline first

Clean filter pressure is a local measurement for your system. Use changes from your clean baseline instead of generic PSI folklore whenever possible.

1

Document your clean baseline

A filter only becomes diagnosable once you know what normal looks like.

Clean or backwash the filter completely.
Record the clean pressure and pump speed/RPM used for the reading.
Note valve positions and whether water features were on.
2

Match maintenance to filter type

Sand, cartridge, and DE filters behave differently and should not be treated as interchangeable.

Map the family before you open it: Pentair Clean & Clear or Quad DE, Hayward SwimClear, ProGrid, or ProSeries, Jandy CL, CV, or DEV, or another exact family.
Backwash sand and DE filters only when the pressure rise or manual indicates it is time.
Clean cartridges when pressure rise, flow drop, or visible loading indicates it is time.
Follow the manual for full teardown, hose cleaning, or media replacement intervals.
3

When cloudy water is mechanical

The filter can only catch what the circulation system presents to it.

Empty baskets and inspect the pump lid and o-ring for suction leaks.
Check return strength and compare it to normal.
Brush surfaces so suspended debris actually reaches the filter.
Vacuum to waste when there is a heavy settled load that would overwhelm the filter.
4

Using DE carefully

DE can sharpen filtration performance, but it is not a casual powder to throw around.

Wear appropriate respiratory and eye protection when handling DE.
Add only small amounts in systems and situations that support it.
Stop if pressure rises too quickly or the filter manual does not support the method.
Stop conditions / cautions
  • • Do not treat DE-to-sand as universal manufacturer guidance.
5

Circulation tuning

The goal is even circulation and enough filtration time for the conditions, not a fixed daily runtime myth.

Adjust runtime for debris load, heat, bather load, and water clarity.
Aim returns to reduce dead spots rather than blasting one wall.
Use higher flow strategically for skimming or cleanup, then back down for efficiency if the system supports it.

Standards & Resources

Manufacturer manuals and model-family index

Use the family index before you assume backwash, cartridge-cleaning, or clamp procedures are interchangeable.

Hayward support center

Hayward's support center links literature, manuals, and troubleshooting guides for filters and related equipment.

Hayward SwimClear owner manual

Official Hayward SwimClear-family manual for multi-element cartridge filter service and maintenance.

Hayward ProGrid owner manual

Official Hayward ProGrid-family manual for DE filter teardown, cleaning, and grid-service context.

Hayward ProSeries owner manual

Official Hayward ProSeries-family manual for sand filter setup, valve operation, and service context.

Pentair pool self-help resource center

Pentair's support center is the right starting point for exact filter manuals and owner troubleshooting.

Jandy support

Jandy support is the official lookup path for manuals and model-specific filter documentation.

Checklist

  1. 1Establish clean filter pressure and use changes from that baseline rather than generic PSI folklore.
  2. 2Understand when cloudy water is chemistry-driven versus filtration-driven.
  3. 3Handle DE carefully and avoid unnecessary dust exposure.
  4. 4Choose maintenance steps that match your filter type and manufacturer manual.

Related Playbooks

Pool Inventory & Equipment ID

Identify what you have on the pad, pull the manuals, and build the reference list that prevents bad maintenance guesses.

Mixed-Brand Automation, Heaters, and Winterization

Map who actually controls pump start, heater enable, valves, chlorination, and freeze response when the equipment pad mixes brands or generations.

Chemical Feeders and Automation Interactions

Map how feeders, probes, ORP, pump schedules, and interlocks interact so automation does not quietly create chemistry failures.