Well thank you for answering all of you. Perhaps I was not very clear in question. It was asked from faciity provider point of view. So more exactly it can be asked as " How a gym and physical training institute can maintain hygeine and environmental safety at public shower area? "
Use the best cleaning products when cleaning out the showers and bathrooms every day - if possible, this should be done more than once a day. I've gone to many gyms and been absolutely horrified and disgusted at the state of the showers specifically.