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Low flow toilets are designed to use less water per flush compared to traditional toilets, which contributes to water conservation efforts. However, one of the primary challenges faced with low flow toilets is their effectiveness in flushing solid waste. Because these toilets use less water, there can be insufficient pressure or volume to adequately clear waste, leading to incomplete flushes. Users may experience clogs more frequently or need to flush multiple times, which can negate some of the water-saving advantages.

This issue is particularly significant in areas where plumbing systems are not optimized for the lower flow rates, or where the actual waste load exceeds the toilet's design capacity. The balance between water conservation and effective sanitation is crucial, which is why this flushing issue is a prominent challenge associated with low flow toilets.