With proper handling, virtually no odor is produced. Odor formation when excrement mixes is caused by the release of gases such as hydrogen sulfide, ammonia, and methane. Various bacteria and yeasts that decompose the nutrients are responsible for the noticeable odors. Therefore, the solids are covered with litter. We recommend ourActivated carbon litter, as it absorbs moisture particularly effectively. Due to its high activated carbon content, it binds significantly more than coconut fibers or wood shavings. In the liquefied mass, as found in a cassette toilet, bacteria, yeasts, and the enzymes produced are especially active. Furthermore, the air supply intensifies the odor. The typical urine smell arises primarily from the combination with water, especially with the dissolved calcium. The limescale that forms over time also contributes to the odor. OurPerfect TTT Urine StonePrevents limescale and odor buildup. The longer urine is collected, the stronger the odor becomes. Therefore, our composting toilets have a maximum canister capacity of ten liters, which is sufficient for approximately two to four days. Generally speaking, odors increase with rising outside temperatures, so we always recommend using a fan.