If they have any recycled materials in them they are not food safe also if anywhere in the process they are exposed to chemicals that may stick to the end product ie mold release lubricants etc those may not be food safe.
Food safe gutters.
The fda s food rule states that materials that are used in the construction of utensils and food contact surfaces of equipment may not allow the migration of deleterious substances or impart colors odors or tastes to food such materials also need to be.
2 cloudy milk and water jugs opaque food bottles.
For instance we drink beverages from aluminum cans.
These are pretty genius actually but the debate continues on aluminum pvc vinyl etc.
Other things to consider is that they do dry out quickly so you have water often i would think lining the back of the gutter with a soaker hose before you add soil would be a simple work around for this.
Zinc is not considered a food safe material and it is recommended to avoid contact between food and galvanized surfaces because acidic foods can dissolve zinc.
This food safe finish option is a very popular oil in today s market for cooking purposes.
Being safe for food growing.
5 rigid containers including some baby bottles and some cups and bowls containers usually used for yogurt.
The hydrocycle pro nft series gutters should be food safe and are sold by farmtek.
2 hdpe high density polyethylene a common use as far as food safe 2 plastic are plastic milk jugs.
4 food storage bags and squeeze bottles.
You also need to consider that whilst metals do leach if you preserve the gutters with some form of chemical paint or other coating this too may contribute to the problem of food safety.
Durable corrosion resistant and nonabsorbent.
Though their professional installation takes only a day leafguard brand gutters offer a lifetime of protection against the many perils of an improperly functioning drainage system including pest.
Sufficient in weight and thickness to withstand repeated washing.
Though be aware that they are not designed for reuse.
Water soda and juice bottles are typically made of 1 pete.
Aluminum gutters may absorb more heat than vinyl gutter which may harm plant roots.
It s commonly used on butcher blocks and cutting boards.
Choose white or other light color aluminum to reduce potential of heat absorption.