as manager of a farternity house, I have some knowledge to bless you with.
Typically, fart brothers have a lot of gusto for an idea that will seemingly make them the coolest dudes on the face of this campus. they go around, collecting money for said idea, and then if they are lucky, one or two of the more motivated fart brothers will go and actually purchase/rent/steal or otherwise attain said idea.
Take the hottub example you have provided us with: it will be ordered to the house (illegal on most campuses due to liability) and the hype will be so great that a facebook party event will get sent out to EVERYONE THE FARTERNITY BROTHERS KNOW. As many of you might presume, farternitys are only friends with loose women and sketchy drug vendors. When all of these so called friends arrive, they all jump in the hottub, drunk. The loose women infect the un-treated bathwater with their loose girl parts, the drug vendors drop their hallucination tabs on accident, and the fartbro's just ooze douchiness in general.
The next morning, there are frogs swimming around and the police are investigating a child pornography crime (cause not all loose women are over 18 at college)
This is how it goes down man, so yeah - hottubs get dirty at farternity houses