debating about going another 6 months before changing the hot tub water. I usually change it every 6 months. We don't use a whole lot over the summer and it's pretty clean right now, but not sure it's worth taxing the well for 250gal of water. We have a deep 500' well, so theoretically about 700gal static, but who knows what the actual level is right now. 1st world problems.