It has never been tested with clay sub-surfaces but I can't see any reason why it wouldn't work well with a 3 layer composition.
There is no prop 65 warning for this product.
With this 3 layer composition, I believe either sized stone will work since the thickness should help with the mullen bursting strength.
I am sure you can it would surely hold the dirt in and let water drain out if heavy rain inundated the area!
I would not see that as a problem, remember this is pervious material.
Yes Polypropylene (PP) is used to make face mask. PP is a raw material that comes from petrochemical companies such as Exxon Mobile. PP can be used for Face Masks, home and garden, construction fabrics, etc. However, each use has different specifications so it is not recommended to use fabric for Home and Garden for Face masks.
The material is a 3osy product. It won't tear
Contact the manufacturer.
This is a non woven fabric