I read about stretching the PDZ with sand here on BYC. Without enough PDZ, I wasn't happy with the odor control since the PDZ is the part that neutralizes ammonia. A friend uses pelletized gypsum on her poop tray, so I bought a bag of that and mixed it in. It's great for the garden but not real absorbent. You can find it in the garden section at lowes or Home Depot.
I'm not real scientific about it, just keep the mix about 50% granular PDZ and it works like a charm.
I'm not real scientific about it, just keep the mix about 50% granular PDZ and it works like a charm.