"It was hard in the early days to get into events," said Mr Dromgool.
But many of his competitors had pulled out of event sponsorship because of cost reasons, he said, noting that events worked best for new brands.
"Last year we did maybe 30 events and had to fight for them," he said. "This year we're doing 150-plus."
Mr Dromgool has a background in technology, production, engineering and lean manufacturing. The syrup is made to his recipe by an Auckland contract manufacturer and he employs teams of students nationwide for weekend events coverage using a system that allows them to get set up very easily.
"The events completely drive sales," he said.
R-Line's first retail outlet was Cycle Obsession in Mount Maunganui, which remains the biggest seller of the product.
"It's easily the most popular supplement we sell," said Cycle Obsession's manager Kris Snow, who attributed the R-Line's success to the flavours, as well as competitive pricing.
"We never had any success before selling a liquid electrolyte, it's always been powders.
"This is the first time a company's managed to launch a liquid electrolyte for us and we've been able to get repeated sales on it."
Mr Snow said he believed that much of the company's success stemmed from Mr Dromgool focusing 100 per cent on marketing and distributing one product. "It's amazing, he seems to have R-Line as the go-to product at a lot of events."