According to rosie readandpost :
yes, we are sure.

If you're not expecting the pool to freeze, I would think all you'd
need to do with an indoor pool is turn off the heater
(if any), put a cover on it, set the timer on the recirculating
pump to be as short as possible (half an hour per day maybe), and
check it every couple of weeks to make sure the injector
still has chlorine (or bromine or whatever it is).

The cover will reduce the chlorine loss.

With the pool heat off, and a very short pump cycle, it'd probably
be a few pennies per day. Which is a small price to pay to
make sure that the pool is _obviously_ in good condition for
a new buyer, and only needs the heat turned on.

If you're expecting the pool to freeze, hire a pro, because the
pool is likely not safe to simply drain _or_ let freeze.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.