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My bottle is actually a 750ml Stella Artois bottle...I designed mine to be somewhat weather resistant...I still need to paint it when the weather breaks...

I use the oyster shell in a 50lb bag from my local TSC. I am also gonna try to grind up old egg shells and use those as well. I am more concerned about the eggshells than the oyster shells. The oyster shells flow out very smoothly...never seem to be an issue. I would think if they did plug...

I made mine a while ago and it works great. Very little waste and they have unlimited access. I love it...mine looks a little different though...I'll try to take pics when I get home...

I wouldn't be afraid of the glass breaking as long as there is no liquid in it. With it being used for calcium and grit, I think its a perfect solution. There's lots of glass exposed to freezing temps on a regular basis and we never give it a second thought. And there are certainly a lot of...