i used it before but truthfully cant see any difference in condition, one thing i do know the birds hate the taste of it,as mine are on open hole if they can get water elsewere they wont touch their own, my friend uses it every day and his birds are no better condition than my own, i cant be bothered with it anymore iam goin leave it out but one thing i should add is i have wild garlic growing in the garden and the birds are forever stripping the leaves of them they cant get enough of them all year round.