This company has the best price for purchasing these pellets in bulk. Good communication and fast delivery. The EziLock Odour system is an absolute knockout. Our two 6yo cats took to it immediately. Previously, we have been using the recycled timber pellet sifting system which required a bit of work. Not the case with this system! No odour. No work. I purchased the maxi box which takes 2 x 2l bags. I am thrilled to report that we are almost at the 4 week mark and the litter is looking like new. Plus, we are only needing to change the pad for 2 cats usage, only weekly. They do use an outdoor sandbox as well. I know this will change when we move into an apartment. Thank you Petso and EziLock Odour.