When buying potting containers do I need to pay attention to what plastics are used? I was out looking for new containers at my local walmart and a regular 5 gallon bucket is 5 bucks, a 12qt pail is a buck fifty, and a potting container is about 4 bucks. I'm leaning to the 12qt pail becuase it's cheap, but will it leach any naughty chemical in the soil? These are the pails located in the automotive area if that makes any difference.