Ann- Do you give the hydrangea root extract to all piggies as a preventative measure or just to piggies with stone issues? Thanks! ~Jaime, Mimi & Captain Phil the betta fish~ ~Missing Albert, Molly, Radar & Daisy~ http://s652.photobucket.com/albums/uu246/chirpy123/ http://www.etsy.com/shop/AintThatCrafty