Watch Tarek El Moussa and Christina Haack Prepare to Tackle 'Monster' Pool in 'Flip or Flop' Series Finale

Tarek El Moussa and Christina Haack are going out with a bang. The final project they embark on for the Flip or Flop series finale includes a "monster" pool that's better described as "a sink hole."

El Moussa, Haack and their trusted contractor, Jeff Lawrence, are all taken aback by the massive work in the backyard that features a gargantuan pool that clearly needs a ton of work and will prove to be expensive. In a sneak peek of the final episode, dubbed "Spanish Lessons," El Moussa initially guesses that fixing the pool alone will be $10,000 because it'll need to be re-plastered and re-tiled.

Lawrence guesses that, because "this thing's a monster," it'll be more in the $13,000 ballpark range. Upon further inspection, El Moussa and Haack also notice cracks, prompting El Moussa to say, "This is not good." Haack responds, "It's like a sink hole."

That being said, Haack remains optimistic about the challenge ahead.

“But look on the bright side," she says before El Moussa chimes in that fixing the pool will increase the home's value. "Yes, that too but we also get to do a fun design like that cool gloss tile or, because it's Spanish, maybe a cool clay tile."

El Moussa shoots down Haack's creative suggestions while walking away from the on-camera interview, leaving Haack alone, smiling and telling the camera, "What about a water slide? Oh, I know. A waterfall!"

El Moussa and Haack in previous flips have tried to pull off the elaborate Spanish design while keeping costs at a minimum. It's proven to be difficult and costly, but they hope past experiences have taught them better as they once again attempt to master the complicated style.

The Flip or Flop series finale sneak peek comes less than a week after it was announced that the show was ending after 10 seasons. The successful HGTV series -- which has spawned several other shows -- premiered in 2013, and during its run, fans got to witness the pair reach new heights as professional flippers and young parents. But the cameras also kept rolling after they experienced hardship too -- from their very public divorce in 2018 to El Moussa battling cancer. They've since moved on to new relationships.

Watch Tarek El Moussa and Christina Haack Prepare to Tackle 'Monster' Pool in 'Flip or Flop' Series Finale

“More than 90 million viewers have watched the popular series since its premiere in 2013. We look forward to seeing more of Tarek and Christina's real life, real estate and renovation adventures in upcoming episodes of their solo series Flipping 101 with Tarek El Moussa and Christina on the Coast," read a statement from the network.

El Moussa and Haack took to their Instagram accounts to confirm the news that their show was ending. El Moussa said the series ending was "bittersweet," but the writing had been on the wall for some time.

A source told ET, "Christina and Tarek felt ready to move on from Flip or Flop. They both have a lot going on in their own careers and personal lives, and the timing felt right. They have a stable coparenting relationship, but working together so closely was sometimes a lot."

The Flip or Flop series finale airs Thursday at 8 p.m. ET/PT on HGTV.


'Flip or Flop': Tarek El Moussa Opens Up About Overcoming Rock Bottom (Full Interview)

This video is unavailable because we were unable to load a message from our sponsors.If you are using ad-blocking software, please disable it and reload the page.

Tarek El Moussa and Christina Haack's 'Flip or Flop' Ending

Inside Tarek El Moussa & Christina Haack's On-Set 'Flip or Flop' Feud

Christina Anstead Says Working With Ex Tarek Has 'Never Been Boring'

Christina Anstead Smiles With Tarek El Moussa After Ant Anstead Split

Christina Anstead Discusses Filming 'Flip or Flop' With Ex-Husband Tarek El Moussa (Exclusive)