1) TOILETS The sewage pipes in Thailand are much narrower than those in many countries, and flushing anything solid will cause blockages. If you disregard this rule and your wad of toilet tissue happens to break the plumbing, it's terrible karma. Most toilets have a hose which you should use to clean yourself.

In Thailand, the general rule is not to flush toilet paper, especially in older buildings, rural areas, and traditional guesthouses. Thai sewage systems and plumbing are often not designed to handle the bulk of paper, which can lead to immediate and messy clogs. Instead, bathrooms are equipped with a small waste bin next to the toilet where used paper should be disposed of. Most Thai toilets also feature a "Bum Gun" (handheld bidet sprayer), which is used for cleaning; the toilet paper is then used primarily for drying off and then thrown in the bin. In 2026, while many modern luxury hotels and high-end malls in Bangkok have upgraded their plumbing to be "flush-friendly," it is always safer to look for a sign or follow the lead of the provided bin. If no bin is present, it is usually a sign the system can handle paper. To avoid causing a plumbing disaster, travelers are advised to use the bidet as the primary cleaning method—a practice that is widely considered more hygienic and environmentally friendly than using paper alone in a tropical climate.