Sometimes things happen. Its possible the HRV opened, we have seen it happen before. We haven't seen them on a vinyl liner pool however, since groundwater would float a liner it's not often used here....
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Does the pressure gauge reset to zero when the pump is off? If it does not, time to replace the gauge itself. Replacement Pressure Gauges
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Some do tile borders, some don't. If you have people coming to use the pool, point out the benches and they'll likely avoid them. It's not necessary to add the tile, more of a personal preference.
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You can plug the pipe coming from the pool, or yes, you can remove the pipe and keep it plugged during the swap. If you have a multiport and you can put it on closed, that may also do the trick. Hopefully...
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If good adhesive was used it's likely going to be very hard to remove. You can always get new vinyl and cut a larger patch to go over the old one if the concern is that it has lifted or opened back up.
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Could be an issue with the filter being dirty and allowing debris to pass through, a broken lateral in the filter, or a crack in a return line. Some more investigation would be in order, starting with...
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It probably went through and got stuck in the filter. You can open up the filter and see if you can locate it - as long as it's not stuck in the pump impeller. It may be wise to call a professional out.
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Home Depot or a supplier should have the steel rods. Clips are sourced at Home Depot or a Specialty fittings contractor.
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A couple of ways to remove organic stains, if you add a couple of gallons of muriatic acid, and brush regularly for a day or two you'll likely lessen all the stains. Once you have done that and brushed...
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