Your search for "shock" revealed the following:
Fi-Clor Bromine Granules
£15.30Fi-Clor Hot Tub Bromine Granules Fi-Clor Bromine Granules are a powerful sanatiser Can be used on their own or to...
Sunspring Plug & Play Swimming Pool Heat Pump
£995.00Sunspring 8kw and 12kw Swimming Pool Heat Pumps Complete With RCD Plug - plugs in 13amp socket Will Extend Summer Season...