"We had a real problem with bird faeces in the water. We had seen a few swallows flying into the tank.
"Everyone was getting sick all the time ... we needed to stop the birds from getting into the water tank ... Bird Stop does that.
"It sits on the hole and the birds can't move it. It's really important because bird crap carries 60 different types of diseases."
When On The Land caught up with Brad, dozens of farmers were listening to him as he demonstrated how the contraption works.
"There seems to be an awful lot of interest in it."
Brad sells his Bird Stop for $35. If you are interested in buying one or knowing more you can call him on 0274810450. He's also looking for an investor.
Meanwhile, the first day of Fieldays was bustling on the first day of the 45th event with 26,648 people through the gates on Wednesday.
Event manager Vanessa Richmond says it is typical for the first day of the event.
"The crowds turned up for our opening day and we're very pleased to be bringing everybody an extra special event this year with several new or reformatted areas.
"There has been a huge interest in our Innovations with its new format competition which has attracted amazing entrants."
Another busy area on day one was Kiwi's Best Kitchen which was extremely popular with visitors enjoying the new layout and demos from chefs, including Josh Emett, and the eight Rural Bachelors competing at this year's Fieldays.
Fieldays runs until Saturday with gates open 8am. Entry is $20 adults $15 children. For more information visit www.fieldays.co.nz