The 9 @,@ 423 @-@ square @-@ foot ( 875 @.@ 4 m2 ) pool used 3 by 3 feet ( 0 @.@ 91 by 0 @.@ 91 m ) pavers that weigh 250 pounds ( 110 kg ) . The pavers was rested on screw jack pedestals in order to be leveled and shimmed . The pavers had to be perfectly leveled for the water to work correctly because the fountain incorporate numerous sensors to regulate the flow and level of the water .