If you go for rubber clippings you do need to recognise that they need more day-to-day maintenance than eg woodchip. If you didn't poo pick very regularly and keep them clean as you went along, the poo would get trodden in to them and would eventually make a nasty mess just as it would in woodchip. On a well- drained site like mine it's possible to hose them down and most of it will dissolve and pass through the membrane (though I think woven membrane with its more open texture is possibly better than the none woven kind. ) However if drainage isn't good you won't want to add to the problems by doing a lot of hosing as well. I poo pick every day, using one bucket for intact poos not trodden in to the chippings and another for dirty chippings + poos stuck to them. These go into a bucket half-full of water to soak and every few days I hose them through, using a large metal garden sieve to hold and drain them. The dirty water goes on the garden and the clean chips back in the run. It doesn't take long, not the most pleasant of tasks but at least you never have to dig out and dispose of a load of messy woodchip. After replacing the clean chips I water the run once a week with a canful of Poultry Shield and sometimes in dry periods I hose it as well. I wouldn't want to do this if I had a large run with lots of chickens pooing in it (mine is 12sq. Metres with 4 birds) but it does completely solve the problem of mud coming up from below and getting mixed in. At least you only have the poo to deal with and if this is done daily the run never smells and is always clean and pleasant. After all they poo the same amount whatever you put down, it's just a matter of how and when you prefer to deal with it. I am not worried at all about metal in the chippings, you just have to be sure you've got good quality ones not made of the wrong kind of tyres to start with. Given this, at least they will never cause foot injuries from thorns etc, as can happen with some kinds of woodchip.
As you have them for good once they've arrived, I wanted to make sure you knew what maintenance is needed to keep them in good condition. They're not for everyone, I recognise, but they suit me and two years on I'm very glad I got them (and so are my girls!)
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