I drained my tub the last weekend in September. I use it in the summer only.
I expect there will always be a little water in the bottom, from rain leakage, condensation, etc...
When I checked the tub this weekend, the water was rust-colored. I though it strange for water not from the city water supply to be so brown.
My cover MAY be the culprit. I noticed one of the weep holes has a black plastic washer which came out and was lying in the tub. I also noticed the stitching came undone on the cover.
Rust-colored water in drained hot tub
Is it possible for the cover to get dirty inside after a few years, and for the dirt, contaminants, etc... to leak into the hot tub if the weep hole loses its washer? I think I saw some brown stains around the bottom of the weep hole, but it looks clean now.
I vacuumed the brown water out. It appears to leave a stain in the tub. Hopefully, the stain won’t affect water quality when I fill the tub in the spring.
For photos, see
https://goo.gl/photos/Sof2pVbL8kE5zAWE7Please advise.