Watering will take place at Aintree this evening as the going continues to dry out on the eve of the Martell Grand National.
Officials have changed the going on the National course from good to good, good to firm in places, bringing it into line with the Mildmay and Hurdle courses.
And the going looks certain to remain fast for the big race.
Clerk of the course Ian Renton said today: "We plan to water all the track on this side of the Melling Road after racing this evening.
"This will cover all of the Mildmay and hurdles courses and just less than half of the Grand National course.
"This is where the good to firm places are and, although I would very much like to get the ground back to the good going of yesterday, I do not think that this will be possible.
"I am pretty confident that the going tomorrow will be no faster than today's. There is a small amount of rain forecast for overnight, but that on its own will make no impression."
Aintree have also acted to provide fresh ground on the Mildmay and Hurdle courses.
Renton added: "We have moved the running rail out about four yards after the last fence on the far side of the Mildmay course, and have saved six yards on the hurdles course and on the home turn of the Mildmay course so that there will be fresh ground on both those tracks tomorrow."
Meanwhile National favourite Star Traveller has done his final piece of exercise prior to the big race at trainer Henry Daly's Downton Hall base.
The trainer said: "He just cantered again this morning and we're very happy with how his preparation has gone.
"He'll come to Aintree tomorrow morning."
Daly would not be drawn into making any bold predictions about his charge.
"We'll just have to see what happens and what will be will be," he added.
Peter Beaumont is to wait until tomorrow morning before deciding whether the top weight Young Kenny takes his chance in the Martell Grand National.
Speaking at Sedgefield this afternoon, the Brandsby trainer said: "The ground seems to be drying up there but they are going to water tonight so we may be all right.
"I'll be speaking to Brendan Powell after he has ridden in the John Hughes but we wouldn't make a final decision until tomorrow anyway.
"We will go down there early tomorrow morning to give us plenty of time to walk the track and see how it is then. If it is not right for him I don't think we will risk him - it wouldn't be fair on the horse."
Paul Nicholls has confirmed there are no ground worries over his quartet of Grand National runners, Escartefigue, Earthmover, Torduff Express and Flaked Oats.
"The ground is safe and they all run," the trainer said.
