Bromine and Chlorine Doses for Winterizing a 4-Person Hard-Shell Hot Tub
Closing a 4-person hard-shell hot tub for winter takes more than draining the water. You need the right sanitizer dose at the right time to prevent biofilm, scale, and a nasty surprise when you refill in spring. This guide gives you exact bromine and chlorine amounts based on typical 4-person capacity.