My stuff looks like the white/blue litter on the right .. Apparently when the blue crystals start to fade the litter has to be replaced ... and so far so good .. he jumped in the box and explored as soon as I put it in .. and he's used it 4 times or more so far and no smell at all As for price here, I paid over 6 dollars for one litter box full worth ... maybe it should last a month? Its not really expensive .. but compared to the other stuff that cost 4 dollars and lasted 4 or more months.. lol