As for the second part of your question, draining is the opposite of filling, obviously, but the issue is only slightly different. You want an ADA compliant steel cable operated rapid flow drain system (very few manufacturers use these but, of course, we do). This should drain in 3-4 minutes depending on your specific sewer system functioning properly. Our suggestion is to wait to use soap and/or shampoo until just before you’re ready to exit the tub. Then you can start the draining process, soap up, and use the hand-held shower wand to sluice away the soap and shampoo while the tub drains. It will almost certainly take you longer to wash your hair than it does to empty the tub!