Standard residential gravity-flush toilets do not rely heavily on high municipal water pressure to operate effectively; instead, they require a minimum water pressure of about 20 to 25 PSI to refill the tank properly and create the siphon action in the bowl. Because gravity toilets utilize the weight of water stored in the tank rather than incoming line pressure for the actual flush, even homes with modest water pressure can achieve powerful flushes, provided supply lines are clear of mineral restrictions. Verification: Check your pressure gauge to ensure your system meets the minimum 20 PSI threshold.
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