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Thanks to all for your answers. At the risk of being told not to ask silly questions, isn't applying lion poo just swapping one lot of feline poo for another? Or is it only domestic cats that cause the problem? Weather permitting, I can try to dig up all the buried excreta but I am worried that some of the parasites might remain. I'll certainly invest in some mesh but it could be a case of shutting the stable door... Do these things have a finite life span?