I posted once already but not sure it went through

Should I add Polyquat this spring? When?

Currently my pool is open. Water was balanced and super shocked to 30ppm about 10 days ago.
FC= 5ppm
CC=0.5ppm ( had been reading 0 until this evening)
pH= 7.4
TA=80
CH=240
CYA=60
Thanks!
15K fiberglass inground
SWCG Nano pilot
Hayward super-pump
Sta-Rite Cartridge filter
Heat pump