The Block NZ's Chlo and Em have their embarrassing toilet blockage revealed on TV

Things got a little bit crappy for Chlo and Em on The Block NZ this week after they revealed they have been secretly hiding a toilet blockage in their Hobsonville reno.

The blockage, which had existed for the past week and a half, required a look at by the plumbers on site - and the other site members didn't let the girls live it down.

"Blockage on The Block!" Amy joked.

"Everyone's talking about it, and I think the girls are just mortified," said site foreman Peter Wolfkamp.

After an investigation with the camera, the girls' tradies had to cut their way through the pipe, and it was not a pleasant experience for anyone...

Watch more of The Block NZ on ThreeNow.