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I would.
because...
Maybe because the water is already six months old and it’s a lot easer and safer to change it now instead of the middle of Winter. :-?
Benny...another new wonderful experience for you..Fresh clean water. My analogy is crisp clean sheets right off the clothes line. So I agree, dump that 5 month old water and enjoy a soak in fresh, crisp water..it's almost as nice as a mid winter soak!!!
Well here is another question. The other times I have drained my tub I get an air lock in my 3rd pump which means I need to unscrew the panels remove the insulation and unscrew the pump union. A real pain in the neck.Any advise on how to avoide the air lock? Can I empty half the water and re-fill?