Older High Flow toilets, of which there are many still in use, can come in 12L, 13L and even 18L varieties.
If you have a 12L toilet, a half flush being 4 liters, you save 8 liters a flush.
24,000 liters / 8 liters = 3000 flushes. 3000 flushes / 365 days = less than 9 flushes a day to save 24,000 liters in one year. Not too difficult if you have a family.
If you have an 18L toilet, a half flush being 4 liters, you save 14 liters a flush.
24,000 liters / 14 liters = 1714.28 flushes. 1714.28 flushes / 365 days = less than 5 flushes a day to save 24,000 liters in one year. Not too difficult if you're a beer drinker.
Not everyone has tanks this size, but many people still do. Regardless the TwoFlush system can be utilized in newer low flow toilets as well, which are usually a 6L variety. That would save you 2 liters with every half flush.
The TwoFlush system is actually adjustable. There is the possibility that it will take less than 4 liters to flush your bowl.
Hopefully this answers your questions.
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