So, without information on the type of plastic, the whole thing is not much use. If you seriously want to grow vegetables and herbs in it, you don't want any harmful substances in your food. Especially with a water-based system, toxic substances can be washed out quickly, so it would be important to have information on the product so that you can compare them. Otherwise, you might as well get harmful wastewater pipes made of PVC, which are at least cheap.

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