The size and type of business usually dictates whether commercial grade plumbing is required for your space. For example, a busy restaurant or movie theater would be best served by having powerful flushometer style toilets and urinals in their public restrooms because they are more resistant to clogging. Similarly, restaurant kitchen require larger, commercial sinks in order to meet plumbing codes. Follow your state and municipal plumbing codes before opening a business to the public. The code will guide you on the types of fixtures that are required.