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Any idea what this part may be, found it on the bottom of my spa this morning. Hard plastic, 1/2" od x 1/4" id x 3/16 thick. Item has a groove and a step.

New pool owner as of January 2022; thoughts on these test numbers. FC 5 PH 7.8 Always 7.8 regardless of MA added TA 100 Always around 100 CH 500 Is this something to be concerned about; new pool filled in Jan 22 CYA 50 Water is always crystal clear, I brought the CYA up from 20 to 50...