It's essentially no different. Plastic flowerpots are made of polypropylene. Resins also need additives (additives are polymers made by addition polymerization). Polymers are formed. But here's the point: polypropylene, not polyvinyl chloride, is toxic, polyethylene is nontoxic. Plastic flowerpots are nontoxic. It was designed to prevent contamination of the basin water, so it's impossible to make it out of PVC. The difference is that the former is made of PVC and the latter is made from the secretions of natural trees.
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