Iron? == == Possibly a slight blockage allowing toilet water to ernter the waste line of the tub
You have to pee when you get in the bathtub because the liquid of the water gats you thinking about peeing, plus the temp. of the water causes your blatter muscles to relax.
soap scum sticks to the side of the bathtub witch causes bathtub rings to form.
You can effectively prevent water from splashing out of the bathtub by installing a bathtub water guard, which is a barrier that helps contain the water within the tub.
Dirt
The water looks colorless when in small quantities but it has actually a very slight blue hue to it. This can be tested with a glass of water and a filled bathtub: the former will appear colorless while the latter will be faint blue.
To prevent water damage from a bathtub overflow, you can install a bathtub overflow drain cover. This cover helps by blocking excess water from spilling over, alerting you to the issue before it causes damage. Other ways to prevent water damage include regularly checking and maintaining the bathtub's plumbing, ensuring the overflow drain is clear, and being cautious when filling the tub to avoid overflows.
The lack of water pressure in the bathtub could be due to a clog or blockage in the bathtub's water supply line. This can restrict the flow of water specifically to the bathtub, while other areas in the house may have normal water pressure because they are not affected by the blockage. Checking and clearing the bathtub's water supply line may help restore water pressure in the bathtub.
It depends on how big your bathtub is.
To turn off the water supply to the bathtub only, locate the shut-off valve near the bathtub. Turn the valve clockwise to close it and stop the water flow to the bathtub.
Insufficient water pressure or incorrect pipe sizing
No, too high of water pressure causes problems.
It is actually faint blue but it is only perceptible to the human eye in large quantities. That's why water looks colorless in a glass but not in a bathtub, for example.