Hired a pool service company. Arranged to be here to talk the tech thru the pool. I keep CYA low @ 30-40 so I can keep chlorine level low. Live in a swamp and tend to get Mustard algae so chlorine level must be higher than I would like already. Also, keep TA @ 60-70 fo keep ph from rising too fast. The tech comes to the house, does NOT knock on the door or let me know he’s here. Dumps a load of bicarb and sanitizer in the pool. CYA now 90 and TA now 125. CSI @ -.49. This is someone that tests pool daily and keeps CSI between -.01 - .01. I realize they cant be as fastidious as I am, but holy cow!