Hi Guillermo - the surface needs to be flat for the suction to be maintained.
Hi Gria - The surface must be flat and non-porous for the suction to hold. I attached mine to a polished stone tile which is somewhat porous and it held for a few hours. Long enough to be usable but very inefficient.
Thank you. This does not have a weight capacity rating as it is used just for stability only. You would not use this in the same way you would use a grab bar.
I don't know if it will handle someone pulling up on bar to get out of tub.with full body weight. You will have to ask manufacture that question. I think it is primarily meant to hold onto and getting out of tub/shower not necessarily using as way to pull up with full body weight.
Try rubbing alcohol out of the bottle, and an old tooth brush. If that works, rinse everything off well and reinstall. If it doesn't work, try vinegar and baking soda, with the tooth brush, and scrub.
I have no idea if it is compliant. It has not worked well for me since the suction eventually gives out, even though it is attached to ceramic tile. It is not reliable for an older person.
Yes, but make sure the suction indicators are green. I don't know how much it can hold, but a lot if the indicators are green.
There should be no delay. On mine, bad is red but good is not green. I can not say what color it is.
The 3 inch dimension is too small to ensure suction cup grip, I should think.