• Tarek El Moussa and Christina Haack will renovate a Spanish-style house in their final "Flip or Flop" episode
  • The exes appear to have different priorities when it comes to the massive pool in the backyard
  • They confirmed last week that the show would be ending after 10 seasons

The last-ever episode of "Flip or Flop" will feature exes and co-stars Tarek El Moussa and Christina Haack having one last disagreement.

The HGTV house-flipping show's series finale airs Thursday at 8 p.m. EDT, and a sneak peek of the episode obtained by People shows things turning tense between the former spouses as they prepare to remodel a Spanish-style home.

In the episode, El Moussa and Haack had different ideas about the massive pool in the backyard that needed at least $13,000 worth of repairs.

"I hate dealing with flips that have pools because they can cost a fortune," said El Moussa after taking a full tour around the property.

However, Haack appeared to focus more on how to improve the house's aesthetics rather than the cost, listing some extravagant ideas she has for the design.

"Look on the bright side, we also get to do a fun design," she said, before adding, "We could do that really cool glass tile or, because it's Spanish, maybe a cool clay tile. What about a waterslide?"

But El Moussa appeared frustrated with her suggestions and ended up walking away from the conversation.

"No. Fill it up with water," he said, before exiting the frame.

Haack seemed unfazed by El Moussa's reaction and went on to brainstorm about adding a waterfall.

Tensions between the exes were first reported last year after a blow-up on set made headlines.

During the confrontation, El Moussa reportedly lashed out at Haack, claiming he "made" her, comparing her to his now-wife Heather Rae Young and calling his ex a "washed-up loser," TMZ reported.

El Moussa later confirmed during an interview with E!'s "Daily Pop" that an incident happened on set. He explained that working with an ex can be "stressful," adding that he regretted it and vowed that it would never happen again.

An unnamed source told People at the time that El Moussa was "super remorseful" about the incident. However, the tipster added, "They're exes who share a history and children and a workplace, but outside of co-parenting, they're not friends."

Last week, Haack and El Moussa announced that "Flip or Flop" would be ending after Thursday's finale episode. The exes shared the news via their respective Instagram accounts, calling it "bittersweet."

An unnamed source told Us Weekly that ending the show after 10 seasons was a mutual decision.

"They mutually agreed they didn't want to go forth with another season," the insider said. "They're both very busy working on their own projects and have a lot going on in their personal lives."

Both stars have their own solo series on HGTV. Haack currently stars in "Christina on the Coast," which premiered in 2019, while El Moussa stars in "Flipping 101 with Tarek El Moussa," which premiered in 2021.

Christina and Tarek El Moussa
Pictured: Former couple and “Flip or Flop” co-hosts Christina and Tarek El Moussa attending the HGTV Santa HQ at Lakewood Center in California on Dec. 13, 2014. Getty Images/Jerod Harris