Getting ready to close soon. Water is in low 50's so I'm turning off the swg and will use liquid shock for Cl until close. Can I use older gallons of shock purchased in August or should I get new? I read in pool school that older bottles of Cl may be lower in concentration, but is there any other problem with using it up? Also, if I do need to get new Cl how should I dispose safely of the old bottles?
Thank you
Thank you