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There are several commercial products available that you can run in a hot tub to get rid of the buildup in the pipes.
Yes, unless you "winterize" it by blowing the pipes free of water before the cold sets in. You should research exactly how to do this on a hot tub website like the one below
Probably because the hot water pipes are right behind the front wall of the tub.
NO, it will not freeze.
Install anti-hammer arrestor in hot water line at tub. It should help.
Hot tub covers can have long lives if they are cared for properly. Hot tub covers are mostly affected by dirt and sunlight so keep it clean and perhaps put a tarp over it if the hot tub is in direct sunlight.
1. Superchlorinate to get rid of bacteria 2. Use a decalcifier or Swirl Away
If the pipes weren't cracked from the water freezing and expanding then you could be ok.
NO Make sure you have drained all of the pipes. You may also want to protect the surface by cleaning it, and using the fiberglass gel and then covering the entire unit with a tarp.
no an example of a convection current is a blow drier
THE HOT TUB IS TO RELAX
You use a hot tub cover after the hot tub has cooled off. Using it while your hot tub is still warm can cause your cover to break.