Truth be known... I only change out the litter once a year. It's pretty deep I would say a good foot or so deep now. I do take a pitch fork and flip it every so often when I think it needs it but I mainly just sprinkle barn lime overtop of it.
It's a really simple method. Lay down 3 or 4...
That's exactly what I use barn lime from rural king. It's a little paper bag that weighs 50 lbs and is about 3 bucks. I also use the deep litter method in my coop and in addition to sprinkling in the chicken yard I also sprinkle it on top of the deep litter (wood shavings) on the coop floor...