Thanks for all your help, I guested it must of been a false reading but had absolutely no idea why and what you’ve explained has helped a lot.
my tub is a wood burning tub, I’ve rigged it up to run through a sand filter and UV light.
Thanks for your response, I just checked the shock, this is the shock I’am using in the photos, I’m completely knew to all this I read that UV destroys chlorine?
Hi, I’m new to hot tubs, my hot tub as a UV light on it so I’m not using any chlorine or bromide, I shocked my tub with non chlorine shock yesterday and when I test the water today it’s should chlorine/bromide, can’t anybody explain this please ?