TDs have claimed that the 100-euro grant for every home will cost the state 35 million euro more than expected.
That's because the government says 1.3 million homes are eligible for the grant - but the CSO says there are 1.65 million households in the country.
Donegal Deputy Pearse Doherty says it's clear the water conservation grant was done in a
The Dáil's Ceann Comhairle could be facing a motion of no confidence in the coming days.
TDs from Sinn Féin and the Technical Group are considering the move after the conduct of business in the Dáil this morning.
The Dail adjourned last night with confusion over how much the state would have to spend on the 100-euro grant for every home.
But when business resumed this morning, the Ceann Comhairle Sean Barrett wouldn't allow that discussion to continue.
Some TDs have accused the Ceann Comhairle of subverting the parliamentary process - and are likely to make a formal call for his resignation in the coming days.