Nothing is maintenance free, especially hot tubs / spas. I kept the ph balance and chlorine level to the low side on the 3 tubs we've owned. How you choose to maintain the tub is up to you.
It's also is governed by frequency of use by yourself and or other invitees. The easiest way to keep it clean[er] is require guest rinse (NO SOAP) prior to entering . Removing basic body oils and loose hair make it that much easier to keep the tub clean. Knowing the balance kept, means (for us anyway) no need to dose it before guest arrive. I added chemicals after they left, giving the tub a chance to cycle, filtering contents.

An ozinator is nice, but still requires chemical's added. You should keep an eye on it even if not used, since water evaporates. Allowing the water level to drop beyond X point can cause filtration and heating issues. Last thing one wants is a heater that craps out 2nd week of januarary, while you're on vacation .
Once you get the hang of it, it's not that big a deal to keep up.