A:AnswerI use them under almost everything and I do see that it can't take high weight. My daughter stool for her vanity sits on one and it definitely leaves indentations. It's okay for us but you will have tire prints over time.
A:AnswerAs long as the ground below it is completely level and flat, I would think it would add protection to bottom of pool in addition to adding some foot comfort
A:AnswerUsing outdoors their going to get nasty and I think would eventually start to break apart.. I use mine indoors for exercise and in my garage around work area and there great.