Let me pose a hypothetical question. Suppose a HDPE bucket was made from recycled HDPE bottles that were used to contain toilet cleaner or motor oil. Would that bucket be food grade? Would you grow any fruit or vegetable in that bucket? I'm not trying to be an alarmist, but I am trying to make people aware.
What I'm saying is that each person should do their homework and decide for themselves if they are comfortable or not with growing food in non-food grade containers.
The 2 with the arrow circles does not mean it is food grade but rather that symbol is used to help ID the material for recycling purposes.
If you are not comfortable growing fruits and vegetables in non-food grade buckets go to WalMart, McDonalds, Subway, etc and ask if they have any buckets that food came in (like cake frosting, pickles, mayo). Chances are you will get these for a great price....free.
I found this info on the internet:
What Is Food Grade Plastic?
The U.S. Food & Drug Administration (FDA) requires that plastics used in food packaging be of greater purity than plastics used for non-food packaging. This is commonly referred to as food grade plastic. Plastics used to package pharmaceuticals are held to an even higher standard than food grade.
Food grade plastic does not contain dyes or recycled plastic deemed harmful to humans. However, this does not mean that food grade plastic cannot contain recycled plastic. The FDA has detailed regulations concerning recycled plastics in food packaging.
Another aspect of food grade plastic is matching the appropriate type of plastic to the food in question. Foods that are highly acidic or that contain alcohol or fats can leach plastic additives from the packaging or container into the food. As a result, you should only use plastic containers that are FDA approved for the particular type of food the plastic will come into contact with.
Finally, it should be noted that a plastic container can no longer be considered food grade if it has been used to store non-food items like chemicals, paint, or detergent.