Expert Verified Updated: March 2026

Pool Flocculant Dosage Calculator

Calculate the exact amount of pool flocculant needed to clear cloudy water based on your pool volume.

Quick Conclusion
To clear a cloudy pool, use ~8 fl oz of liquid flocculant per 10,000 gallons of water. This binds suspended particles, causing them to sink so they can be vacuumed to waste.

Technical Comparison

FeatureFlocculantClarifier
Action Speed24 Hours (Sinks to Floor)2-3 Days (Filter Removal)
Water ClarityCrystal Clear (Heavy Particles)Good (Daily Maintenance)
EffortHigh (Manual Vacuum to Waste)Low (Filter does work)

The Science of Flocculation

Flocculants contain long-chain polymers that act like magnets. They bind together microscopic particles that are too small for your filter to catch, forming larger, heavier 'flocs'. These clumps fall to the floor of the pool, where they can be physically removed.

This process is the fastest way to clear a 'pea soup' pool or extreme cloudiness after an algae bloom treatment.

Actionable Steps

  1. Balance pH: Ensure pH is between 7.2 and 7.4 for maximum effectiveness.
  2. Add Dosage: Pour the calculated amount of flocculant around the pool perimeter.
  3. Recirculate: Run the pump on RECIRCULATE for 2 hours to mix thoroughly.
  4. Turn Off: Shut off the pump for 12-24 hours to let particles settle.
  5. Vacuum to Waste: Slowly vacuum the visible sediment directly to the WASTE line.
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Safety Warning: Never allow flocculant to enter your filter media (Sand or DE). It will gum up the filter and require an expensive media replacement. Always vacuum to WASTE.

Pro-Tip

If you don't have a 'Waste' setting on your filter, you can siphon the flocculent out using a garden hose to avoid clogging your cartridges.

Frequently Asked Questions

Clarifier vs Flocculant?

Clarifiers help the filter catch small particles. Flocculant sinks them to the floor for manual removal.

Can I use it with a cartridge filter?

Only if you have a way to bypass the filter and vacuum to waste (drain).

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