stall enzymesavailableat pet stores work great. a gallon is about $20. i used stall pellets only on web spot where he routinely pees. then take enzyme, cut in half with water, spray and throw a few pellets on top, than flakepinebedding!! never smell it until I uncover it to clean. i have a 23 yo horse with respiratory issues, he is bothered mostly by dusty hay.