Performed a full drain and refill on my pool and spa. I thought I'd have some CYA left over residue, but it appears to be mostly gone. pH is a bit high as well, but easily treated with some MA. What is the best method to add some CYA?
Pre drain:
pH: 7.64
FC: 13 ppm
CH: 475 ppm
CYA: off the charts (>100 ppm)
TA: 110 ppm
Post drain:
pH: 8.49
FC: 0 ppm
CH: 200 ppm
CYA: None discernible
TA: 110 ppm
Pre drain:
pH: 7.64
FC: 13 ppm
CH: 475 ppm
CYA: off the charts (>100 ppm)
TA: 110 ppm
Post drain:
pH: 8.49
FC: 0 ppm
CH: 200 ppm
CYA: None discernible
TA: 110 ppm