Welcome to the forum!We are in Tennessee and we leave our Intex 12x24 pool up all winter. We have Fox Pool and Spa come out in early October to close our pool and put in chemicals to keep it from growing anything, they pump out part of the water, put a cover on it along with a pump that sits on top of the cover. After bad weather we go out and turn the electric pump on to clear the water off the cover. Then we schedule them to come back on April1st to reopen our pool for the Summer. They clean the pool,fill it back up, put the saltwater chemicals in and we are ready to swim.
We do check the water every two weeks or so. We take a sample to Fox and they give us a report on everything to do with our pool water. It is generally perfect and if not, they tell us exactly what to do.
I hope you decide to take control of your pool (and $$) yourself this season. At TFP we promote self testing / self maintenance.
There is no need for 'Winter Chemicals' & 'Saltwater Chemicals'.
I close and open my Ultra Frame myself every year, the only thing I use for either is chlorine.
I hope you will have a read through our Pool School, especially ABCs of Pool Water Chemistry.
Thanks for posting, nice to have you with us.