"There are inherent risks with any water sport," he said. "But these risks are significantly reduced when the item is properly used under the recommended guidelines."

Erica Bush, director of customer services, said she has heard nothing but positive feedback from customers about the kite tube, and agreed proper adherence to the instructional DVD, which is included with each purchase, can prevent serious injury.

"We recommend riders, boat drivers and operators to watch and adhere to the instructions on the DVD," she said.

Kevin Schneider said park managers appreciated input from SportsStuff representatives but the prohibition will remain in effect.

"In light of all that has taken place, we decided the prohibitions are necessary for the safety of our guests," he said Thursday.

Mayer said he doubts the kite tubes were used improperly when the four serious injuries occurred.

"All victims were using the kite tube as directed when they suddenly lifted to dangerous heights, became unstable and plunged down to the water surface," he wrote in the safety alert he sent to the U.S. Consumer Product Safety Commission and nearly 400 other parks across the nation.

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