New litter box odour control mechanism

I learnt this last week after a chat with a friend who has just recently got his third cat. To eliminate any foul odour from the litter boxes besides the usual diligent clearing and cleaning of the litter boxes, he places a small tub of coffee grind next to the 3 litter boxes. It seems to work quite well as I did not detect any foul smell within 1m of the boxes. I did a little research on the internet and apparently, coffee beans absorb any smell in its vicinity and can help in odour control.Therefore, I have collected some spent coffe grind from the office coffee machine and have placed it in a mid size flower pot (the bigger the opening the better). The pot has a heavy base and will hopefully prevent May May, the nosiest parker of them all, from toppling it over. I have also covered the pot with an old stocking of the Wife to prevent them from digging up the grind and also to prevent spillage should MM manage to topple it over.

And now, fingers crossed. Maybe the coffee grind will really work wonders. If it does, it is really recycling since the coffee grind is destined to be thrown away anyway. As the grind is damp, fungus will probably start growing in it in a week or two. Then that will have to be thrown out and refilled.

Add-on on 21 Nov 10, Sun morning: The coffee grind worked. I checked out the litter box area this morning and there was no smell even though they did their business in the boxes during the night. There was a faint coffee smell around the area though. And they did not topple the pot at all.