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    $\begingroup$ Not a complete answer to your question, but with respect to the silica gel, it's only toxic when its a fine powder of the type used for chromatography. The toxicity is not due to the compound itself, but in the size of the particles. In its bulk form, silica (aka. silica dioxide) is even taken as a homeopathic treatment (dailymed.nlm.nih.gov/dailymed/fda/…), no idea what health benefit it supposedly gives but its certified as not being toxic in any event. $\endgroup$
    – NotEvans.
    Commented Dec 23, 2015 at 16:49
  • $\begingroup$ (1) It is safe (2) Yes cat boxes stink so the litter generally has a perfume which the cat releases when it digs in the litter. (3) The litter needs to be a deep enough layer so that the cat urine doesn't reach the bottom of the box. (4) The whole litter box needs to be dumped occasionally rather than just replenishing it. $\endgroup$
    – MaxW
    Commented Dec 23, 2015 at 16:49
  • $\begingroup$ If the smell of scented cat litter bothers you, I would recommend switching to an unscented cat litter product. It still controls the odor quite well since it dehydrates the urine and feces. Either way, you are better off not putting off cleaning the litter box too long. The scented product masks but does not eliminate the natural odor of used cat litter. Why introduce extra chemicals into the environment that we do not actually need? $\endgroup$
    – iad22agp
    Commented Dec 23, 2015 at 17:29
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    $\begingroup$ Oh, no, it's not the scent of the urine, it's clearly the sent of the crystals themselves. The box can be freshly filled with litter, I can shuffle the grains around with shovel and the toxic smell comes up. Same as when the grains are poured into a freshly cleaned box. $\endgroup$
    – tomsseisums
    Commented Dec 23, 2015 at 18:00
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    $\begingroup$ Not to nitpick , but a smell cannot be "toxic". Cyanide apparently smells like almonds, or to put it differently, almonds smell like cyanide. Trying to interpret toxicity using only smell is a fool's errand. $\endgroup$
    – Curt F.
    Commented Dec 23, 2015 at 18:06