hi jinty, i have four hens in a house about 120x60cm, nest boxes extra. I just brought a new bale of wood shavings that will probably last me for 5 months or more! But i might try hempcore next time, athough it is about £5 more! Will deffinaltly try and get some biodri soon. l would like to buy it localy but i dont think anyone stocks it here, so will have to pay a £6 or more dilivary charge and order it online!