What are the differences between ferric trichloride and polyferric chloride?

Ferric trichloride: Also known as iron chloride. Molecular formula: FeCl3. Appearance and properties: Black-brown crystals, sometimes in flake form. Molecular weight: 162.21. Boiling point: 319°C. Melting point: 306°C. Solubility: Highly soluble in water; insoluble in leather oil; soluble in methanol, ethanol, propanol, and ether. Density: Relative density (water=1): 2.90； Relative density (air=1): 5.61. Stability: Stable. Hazard symbol: 20 (acidic corrosive). Main uses: Used as a treatment agent for drinking water and wastewater, as an oxidizing agent and mordant in the dye industry, as well as a catalyst and oxidizing agent in organic synthesis. 2. Environmental impact: I. Health hazards: Routes of exposure: Inhalation, ingestion, dermal absorption. 　　Health hazards: Inhaling dust of this product has a strong irritating and corrosive effect on the entire respiratory tract, damaging mucosal tissues and causing chemical pneumonia and other conditions. It is highly corrosive to the eyes, and in severe cases can lead to blindness. Skin contact can cause chemical burns. Oral ingestion causes burns to the mouth and digestive tract, leading to severe abdominal pain, vomiting, and collapse. 　　Chronic effects: Long-term consumption may cause liver and kidney damage. II. Toxicological data and environmental behavior Acute toxicity: LD50 of 1872 mg/kg (oral administration in rats). Hazardous characteristics: Decomposes under high temperatures to produce toxic and corrosive gases. 　　Combustion (decomposition) products: chlorides. Polyaluminum ferric chloride: Also known as polyaluminum ferric chloride or brown flocculant, with the English name PAFC. It was developed through further research based on the hydrolysis and coagulation mechanisms of polyaluminum chloride and iron oxide. This product features an enhanced molecular structure, which improves its capabilities in electro-neutralization, adsorption and bridging, as well as sedimentation. There is a very significant improvement in the form of both aluminum ions and iron ions. The degree of polymerization of this product also increases considerably. In terms of appearance: the liquid form is a transparent brown or reddish-brown substance without any precipitates, while the solid form is a reddish-brown or reddish powder that is highly soluble.