The band were led by vocalist Dave Williams from 1999 until 2002, when he died from a previously undiagnosed heart condition.
Jason Jones replaced Williams but left the group in 2004, and his replacement Ryan McCombs quit to rejoin his former group SOiL last November.
"It's been a real pleasure for all of us working with Jasen Moreno," said guitarist CJ Pierce on Facebook.
"He jumped right in and stepped up to the plate. He's everything we hoped for in a singer. Jasen came in and got straight to work on new music for our next CD."
He continued: "Out of respect to all past singers and most importantly the Drowning Pool fans he learned every song from every CD we've made in the past as well.
"Jasen has brought us not only a new voice but a new fire to the Drowning Pool sound. We all can't wait to get the new music out to there to everyone."
Pierce added: "With the live show. We just did a two week run and I have to say. I haven't had this much fun in over ten years. It's really great playing a lot of old songs and jamming some of the new tunes as well.
"I think some of my favourite moments on this run is when fans come up and request songs and we can play any song from any CD for them. Looking forward to the rest of our career with Jasen. The Singer switch is finally over!"
Watch Drowning Pool play their hit 'Bodies' with Jasen Moreno below: