I have a home spa/hot tub which takes copper-based disinfection and have run out of the chemicals. Does anyone know where these can be bought? Have already searched Home Pro et al. Thanks

I found what I needed at Pool&Spa, head officee is near Suvanabhumi airport and branch shops in several locactions in the city

http://www.poolspa.co.th/

And wonder of wonders, they respond to email inqueries in English, a rarity among Thasi businesses in my experience. Indeed they were extremely helpful and seem to stock a wide range of chemicals and filgter deviices.