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Fish Pond Water Purification Special Polyacrylamide

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I. Core Functions for Fish Pond Water Purification

Polyacrylamide (PAM) manufactured by Chinese producers purifies water through long-chain adsorption-bridging and charge neutralization. It flocculates sediment, residual feed, aquaculture excrement and algae debris into large flocs for rapid sedimentation.

  1. Rapid clarification of turbid water: Significantly improve water transparency, stabilize water quality and balance algal growth.
  2. Turbidity reduction and sediment stabilization: Settle suspended organic matter, reduce black and heated sediment at the pond bottom, and cut down oxygen consumption.
  3. Reduce ammonia nitrogen and nitrite nitrogen: Bind colloidal toxins to indirectly lower the toxic load of water body.
  4. Tail water treatment: Flocculate and settle aquaculture drainage to meet discharge standards or realize recycled reuse.
  5. Combined use with PAC: Polyaluminum Chloride (PAC) first coagulates fine particles, then PAM bridges particles to form larger flocs for faster and cleaner sedimentation.

II. Special PAM Models for Aquaculture

  • ✅ Anionic Polyacrylamide (First Choice): Low toxicity, mild property, suitable for neutral and weakly alkaline fish pond water; fast flocculation, no damage to fish and shrimp gills, safe and compliant for aquaculture.
  • ✅ Non-ionic Polyacrylamide: Ideal for acidic turbid water, low-temperature water bodies, and safer for high-end shrimp and crab seedling breeding.
  • ❌ Cationic Polyacrylamide Strictly Prohibited: Extremely high toxicity; easily adheres to and clogs fish/shrimp gills, causing suffocation and mass death. Forbidden to use in all fish and shrimp ponds.

Mandatory Safety Indicators

Only food/aquaculture-grade PAM is allowed: Acrylamide monomer residual ≤ 0.05%. Industrial-grade PAM is strictly prohibited from being applied to fish ponds.

III. Safe Dosage for Aquaculture (per cubic meter of water body)

  • Ordinary turbid water: 0.1～0.3g/m³
  • Severe muddy turbid water: ≤0.5g/m³

Principle: Less is better than excess. Excessive dosage will cause gill clogging, oxygen deficiency, algae collapse and dead algae outbreak.

IV. Standard Application Methods

  1. Never sprinkle dry powder directly. Prepare a dilute solution of 0.1%～0.2% in advance (1g PAM diluted with 1～2kg clean water).
  2. Dissolve in normal-temperature clean water, stir slowly for 30～60 minutes until no lumps or undissolved particles remain.
  3. Spray the solution evenly across the whole pond; apply PAC first, then add PAM after an interval of 5～10 minutes.
  4. Keep aerators running during the whole application process. Settling flocs consume dissolved oxygen and may easily cause oxygen deficiency and surface floating of aquatic organisms.
  5. Prepare and use the solution on the same day; do not store overnight solution.

V. Safety & Potential Risks

  1. Qualified aquaculture-grade PAM is non-toxic itself. Hazards mainly come from excessive local concentration, excessive acrylamide monomer residue and misuse of cationic PAM.
  2. Main risks: Dense flocs wrap gills → blocked respiration and oxygen-induced death; overly clear water → massive algae death, algal collapse and bottom stirring.
  3. Medication taboo: Do not use together with disinfectants, insecticides or bottom-improving agents on the same day; maintain an interval of no less than 48 hours.
  4. Avoid application during seedling breeding period, shrimp/crab molting period, and sultry oxygen-deficient weather.

VI. Common Misunderstandings

  • Using industrial-grade cationic PAM will lead to mass death of fish and shrimp.
  • Direct dry powder application causes caking, gill adhesion, zero efficacy and potential toxicity.
  • Overdosage results in ultra-clear water without beneficial algae, oxygen deficiency and pond collapse.
  • Dissolving at high temperature breaks molecular chains and completely invalidates PAM.

Summary

Standard application of aquaculture-grade anionic or non-ionic polyacrylamide is safe with no bioaccumulation, no residual pollution and no harm to fish and shrimp. All potential dangers stem from misuse of cationic PAM, application of substandard industrial-grade products with excessive monomer residue, overdosage, direct dry powder spraying, and operation without turning on aerators.

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