Recepies without substances which are considered harmful for aquatic life like:

• Copper / Copper alloys 
  
• Zinc / Zinc alloys 
  
• Recepies wihout carcinogenic substances like: Antimony trisulfide (Sb2O3) 
  
• Free of critical curing- und processing aids 
  
• Free of fluorides or halogenides 
  
• Free of lead, asbestos, chrome, crystalline silica