honestly? i have no idea however, they're these neat little pellets of (i assume) compressed pine sawdust. so solid waste matter just kind of sits there and can be scooped and flushed and liquid breaks the pellets down to dust thereby releasing a nice piney smell. it never smells badly (used it for a month), one bag lasts at least a month, and it's relatively cheap (less than $5.00 per bag).
http://www.naturesearth.com/felinepine/#
|