How does a weekly pool service maintain chlorine levels for the entire week? I have a pool guy servicing my rental and he shows up once a week. I'm doing my own pool and I'm adding chlorine every day. I believe my pool guy is just adding liquid chlorine since I don't see any tabs or floating dispensers. My rental pool water seems to look fine. I'm just curious what happens when it starts getting warmer and the rental pool is used daily.