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We definitely use or tub just as much. I use any thaw we get to rinse the filters and add more water. Since its just the two of us in it, I can fill a little above the water line and hope for the next thaw. Can you keep a hose in a warm area in case you have to add?
Just ducky,The first thing I do different in winter is change from dichlor to bromine tabs in a floater. That way if I don't make it out for a few days due to weather, keeping it clean isn't a bother. In spring, I switch back to dichlor. I also use it less in the dead of winter, so I use less chemical and test strips. I also will push my shocking and filter changes out some depending on how much. For filter changes, I have two filters and just quickly swap. For winter, I purchased one of those big plastic tubs with the rope handles at most stores for $5. I cut a 4 inch diameter hole in the bottom and put it over the floor drain in my utility room. I have a hose hookup in the utility room to clean and rinse the filter. You could do the same in the shower but my wife doesn't like the idea of chemicals in the tub. Other than that, it is business as usual.
I stick with Chlorine through the winter months here in Canada, i am also running a Nature 2 stick (Proclear) so the one bonus with that is it allows me some flexibility in chemical additions. Its worked well so far this winter, water still Crystal clear from the mid Oct Fill. Filters i clean when it warms up enough outside to hose them down, so far been about once a month but seems to work fine. I would say if you dont like venturing out in the cold to do the maint. that you look at the nature 2 as a add on or as above flip it to Bromine.
I am really the minority here... I have had my tub for about 18 months. I simply go outside once a week and pour a little dichlor in the tub. Thats it... I will clean the filters when I change the water. I last changed around thanksgiving.. .Now i will probably wait until March or April. The tub stays very clean but honestly i don't use it that much.I know I am going to get yelled at here but don't really test the water too much or add other stuff too it. Also When not using it for a week or 2 at a time I keep it on 80 degrees that may help.But once again... I know I am not doing things the right way.
I live in Alaska, and so am used to the cold. I dont let the weather stop me enjoying the tub. On the contrary, I like taking a dip in the winter more than the summer. It is more beautiful out and quieter as well. I use the floating bromine tab dispenser, and use the two filter method as well. I keep the spare filter in a sealed bucket with filter cleaner with it. When I am ready the change the filter, I clean the soaking filter off, it is easier to get alot of stuff off of it because it has been broken down more by the cleaner solution. Hope this helps!!