While I have not had a problem as of yet, but with the recent adoption of two more little ones (if 2.8# and 3.5# can be considered little) the time may come. So I ask of you that may know... I saw an item while browsing the pet isle this evening called "Odor Scentry". The only ingredients were Orthophosphoric Acid and Dicalcium Silicate. I am assuming the silicate is a non caking agent. It says on the package the product prevents the formation of ammonia thru "chemical bonding". It is said it is non toxic. Has anyone heard of this? Has anyone used it? Is Ortho...Acid something that can be obtained "over the counter" by passing the mfg/markup? I currently use Tidy Cat and have no major problem with it. I am seeing however that box cleaning will become a required daily chore, where as before it could go for two days. Have checked all the local (TN) pet stores, to include the chains) and have been unable to locate Feline Pine to give it a try. Thanx for any and all input. Al (175) Daisy (1.5), Luke (2.5),Bo (3.5) and BabyGirl (2.8) [Posted in FML issue 1645]