New House, Old Pool, Can't get spa suction to work

Hello, thanks for all of the help you provide to new people like me. I have a pool/spa combo and on the bottom of my spa are what I assume are two suction drains. However, there are also these red/brown hard as rock scales that are there and I can't get them to break off. Also, it looks like the things at the bottom here twist, I tried a little to no avail, but didn't want to try too hard, just in case its not supposed to turn. I'm at a loss as to why the spa suction isn't working. When I...

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