Can polyaluminum chloride be used in aquaculture

The following is an analysis on whether Polyaluminum Chloride (PAC) can be used in aquaculture, combined with the core advantages and practical points:

After the rainstorm, the fish pond became a muddy bath overnight. Can polyaluminum chloride save the emergency?

A: Yes! But you must choose the right type and use the right method

Emergency clarification of clear water: When the rainstorm washes the mud and sand into the pond, resulting in turbidity, drinking grade PAC (yellow) can quickly flocculate suspended particles through electro-neutralization within 48 hours, and the turbidity removal rate is over 90%.

Safety premise: it is necessary to choose drinking water grade products in line with the "Drinking Water Sanitation Standard" (GB15892-2020) (aluminum oxide ≥29%, arsenic ≤0.0002%), and avoid the risk of heavy metal residue of industrial brown PAC.

Case practice: After the typhoon, the aquaculture farmers in Yancheng, Jiangsu province sprayed drinking water grade PAC at a dose of 2 kg/mu. The water transparency was restored within 24 hours, and the stress mortality rate of fish decreased by 60%.

Can PAC suppress the green film of cyanobacteria outbreak in the pond quickly?

A: It is effective to suppress algae in the short term, but it needs to prevent rebound in the long term

Emergency algaecide: PAC destroys the charge balance of algal cell wall and makes cyanobacteria and green algae flocculate and sink. When sprayed at a concentration of 3g/m3, the algal density decreases by 70% within 72 hours.

Limitations: It is a chemical "decapitation action" and cannot eradicate algal toxins. After using it in a silver carp pond in Jiangsu province, algae recurred within 5 days, so microbial preparations should be used to maintain long-term balance.

Is it true that PAC can poison fish and shrimp?

A: There are risks, but they are manageable

Hidden risks of aluminum: excessive use may lead to the accumulation of aluminum in fish gills and crustacean liver pancreas, which can inhibit the success rate of Japanese shrimp molting up to 30%.

 critical control point ：

Dose: less than 3 grams/cubic meter of water (about 2 jin/mu), more than 5 grams/cubic meter will cause flocculation to float and bottom sediment oxygen deficiency;

Silt removal: The sediment sludge must be removed within 48 hours after use, otherwise hydrogen sulfide will be released by decay.

What scenarios should never use PAC?

Right use is a magic weapon, wrong use is a poison

Polyaluminum chloride acts as a "chemical scalpel" in aquaculture—— Drinking-grade PAC can precisely address sudden water quality issues (storm-induced turbidity, algal blooms), but it must be used with precision and for short-term effectiveness. Once water clarity is restored, let's return the stage to microorganisms and aquatic plants—— Chemical agents ultimately play a supporting role, while ecological cycles remain the eternal protagonists.