I believe it would do the opposite. The litter absorbs the moisture (urine) and then forms a hard clump. I wouldn't think the soil could extract moisture from it like the crystals you mentioned. The crystals work the opposite; When they absorb the water, they become soft and gelatinous. I'd think the best (and fun) way to find out would be a little side-by-side test. Perhaps two separate pots with the same type/size plant and try the crystals in one and litter in the other. I'd keep them together in the same area or win...

I believe it would do the opposite. The litter absorbs the moisture (urine) and then forms a hard clump. I wouldn't think the soil could extract moisture from it like the crystals you mentioned. The crystals work the opposite; When they absorb the water, they become soft and gelatinous. I'd think the best (and fun) way to find out would be a little side-by-side test. Perhaps two separate pots with the same type/size plant and try the crystals in one and litter in the other. I'd keep them together in the same area or window and be sure to give the same amount of water so conditions would be the same. Actually, maybe I'll try that some time... Good luck!