In my state you can 14/30 the resident (gives them 14 days to correct the situation or 30 days to vacate and if it happens again within 6 months of the infraction then you have the ability to go forward with an eviction). I agree with people before with being sure to document each interaction both in your system but I would also do an email so that you would have proven interaction and attempts to allow correction just in case it does come to eviction.
In extreme situations, I've closed the pool for bout a week or so and notified the residents due to continuing issues (ect) the pool is closed until further notice... it's like grounding the residents Then typically the good residents keep the bad ones in order because they don't want the pool to close again. It helps to get the good residents involved because you can't watch the pool 24-7 and don't always know who is causing the issue.
Have the residents self police and report. If they know that the amenity could be shut down for just a couple of bad apples then they will more than likely try to report so it can stay open.
I have this issue at the complex I live in right now. The pool is closed for the second time this month to clean out glass contamination. They sent out an email that they are posting a security at the entrance and will be issuing bracelets that are required for admission- like at a swim park. Not sure how long that will be done or if it will last.
We have a key card access system for all of our common areas. If the rules are broken in any of the areas, (pool, dog run, patio area, fitness room, business center) we are able to deactivate their key card completely, or for a specific area. I follow up with a letter, explaining that their privileges have been temporarily or in some cases, permanently removed from their key card.