You are using chlorine; UV does NOT sanitize; you do not need stabilizer on an indoor pool . . . but you probably already have a bunch there.

Most likely, you have a very low bather load on the pool, and that's the reason you've been able to get away with what you're doing. But, it's not sanitary, and ultimately, it's not safe.

UV does have some value on indoor pools, but not as a functional sanitizer.

We've explored this sort of thing at length before. If you want to read some other long posts, I'll find some for you. But I won't have time to run out yet another long discussion on chlorine, UV and indoor pools till after the 4th.

By the way . . . if the same dude got you on both the A&H tabs & the UV, you need to put that guy firmly in your 'either a half-wit or a hustler' category, and stop trusting him.