More importantly, know that your hostel/restaurant/airport is not joking when they ask you not to flush toilet paper. The sewage pipes in Thailand are much narrower than those in many countries, and flushing anything solid will cause blockages.
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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.
Additionally, toilet paper can take years to break down and decompose. So, flushing is the more environmentally friendly option. You could try an alternative solution, which may be using recycled toilet paper if you can find a brand that is BPA-free, chlorine-free, 100% recycled, and unbleached.