Thank you for your question regarding the Delta Foundations® Elongated Toilet and I am happy to help you today.
While this toilet is only designed to use 1.28 GPF (gallons per flush), you may also hold the flush lever down for a few seconds longer to allow for more water to flow through the tank into the bowl, which will help to clean the bowl and still conserve water, since older toilets were designed to use anywhere from 3-7 GPF. This will also allow for more water to stay into the bowl, the longer you hold the flush lever down.
I hope this is at least somewhat helpful and if you need further assistance, please feel free to give us a call on our warranty line at 855-345-1345 and we will be happy to help you where we can.
Date published: 2018-06-08