When Mr Harrison arrived on the scene, the experienced snake catcher began streaming the visit live on Facebook and was disturbed at what he found.
"Look at the ticks on him. Jesus Christ," Mr Harrison exclaimed on the video.
"I've never seen anything like this. I've done this for 26 years and this is the worst I've ever seen."
It is thought that in a desperate bid to save itself, the python appeared to have entered the swimming pool to try to drown the parasites.
During the video, Mr Harrison tried to make sense of what he was seeing.
"What happens is in Mother Nature, animals can live in harmony with parasites both internal and external," he said.
"If something happens to them the parasites get the better of them.
"He's got hundreds of paralysis ticks on him. That's why he's in the water, he's trying to drown them."
Mr Harrison said reptiles have a higher tolerance to the poisonous ticks than mammals and humans.
The python, now called Nike, was removed from the pool and taken to the Currumbin Wildlife Hospital for treatment.
It took many hours for vets to remove the 511 ticks from the animal's body.
But despite the agonising procedure, Nike still hasn't been given a clean bill of health.
"There are still tiny young ones under the scales that will be treated with drugs to kill them," Mr Harrison said.
A Currumbin Wildlife Hospital spokeswoman told the ABC that Nike was still in their care.
"We're running tests, trying to find out what's wrong with him," the spokeswoman said.
This is the second time in less than a month that a snake has been covered in something strange.
Earlier this month a snake was found covered in cane toads, as they hitched a ride to safety following floods in Western Australia.