What is FOG and what causes it?

FOG is an acronym for Fats, Oil and Grease. It is caused by unwanted cooking oils, grease and food being poured down the kitchen drain. As the oils and grease cool in the collection system pipes it congeals, hardens and mixes with other solids creating blockages. This can cause unnecessary, expensive and messy backups in homes and businesses.

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1. What is FOG and what causes it?
2. How can I help?
3. Are there other items that I shouldn't flush?
4. Other than residential, who else creates FOG?