I'm just as picky with my feeders as I am with my buckets. I want to make sure the feed isn't going to damage the feeder (saves me having to buy/make new ones), but I'm also I'm concerned about the feed leaching stuff out of the feeders. So ...
the only metal I'd use would be stainless steel (yes, other metals can leach lots of nasty stuff, but FF can damage metal pretty quickly),
I wouldn't use "treated" lumber for a feeder (this includes plywood and, IMO, painted wood),
and I prefer fresh "food grade" plastics.
Glass/enamel are nice for lots of reasons and I consider them "safe" in theory, but old-school enamel can still have toxins, and when I was using pyrex loaf pans for my FF, the edges got chipped which "ruined" them IMO, but also "where did the chip of glass go?" concerned me.
Some people will say this is "wrong" of me to be careful about these things, but I find "being careful" up front saves me headaches down the line. It took me too long to get my PVC troughs set up (not because they were hard to set up, but because it took an extra pair of hands to do the cutting), but they are working out really well and are saving us lots of time & effort. A bonus is the cement blocks they are set in give the birds a great rough surface where they can rub their beaks, which is good for the birds.
the only metal I'd use would be stainless steel (yes, other metals can leach lots of nasty stuff, but FF can damage metal pretty quickly),
I wouldn't use "treated" lumber for a feeder (this includes plywood and, IMO, painted wood),
and I prefer fresh "food grade" plastics.
Glass/enamel are nice for lots of reasons and I consider them "safe" in theory, but old-school enamel can still have toxins, and when I was using pyrex loaf pans for my FF, the edges got chipped which "ruined" them IMO, but also "where did the chip of glass go?" concerned me.
Some people will say this is "wrong" of me to be careful about these things, but I find "being careful" up front saves me headaches down the line. It took me too long to get my PVC troughs set up (not because they were hard to set up, but because it took an extra pair of hands to do the cutting), but they are working out really well and are saving us lots of time & effort. A bonus is the cement blocks they are set in give the birds a great rough surface where they can rub their beaks, which is good for the birds.