Just called out by a very reputable local hotel to save them.
30x50x4 plaster pool.
15ppm fc
7.4 ph
130 alk
375 ch
70 cya
83 deg F
110 gpm
Primary sanitizer is tabs.
Yesterday, day one, I put in 4 gal liquid cl (12%) to take my fc to 27 ppm which would be shock level according to the kick...