I am using KD pine, super big bag which is about waist high, last about 2 months.
I have a cage similar to ferret nation with 2 floors, I am currently using a bare stainless steel pan with a toilet, tried putting fleece on the pan, but they just loved to pee on it, and it stank after the 2nd day. Without the fleece, they were good girls and peed in the dish.
I spot clean the 2 cages everyday and clear the whole cage every week.
As for pine causing respiratory problems, could it be pine, not KD pine, my vet wasn't happy with me using pine as bedding for the above reason, and urged me to change to pellets or plain paper.
Can anyone explain why KD pine is safe for chins?