How Do You super Chlorinate A Hot Tub and reduce alkalinity?
your PH and Alk should move together on a test strip. Ph down is the best way. Here is a picture.
https://www.bing.com/images/search?q=ph+down+leisure+&view=detailv2&&id=C0FCD229D6BDFE53A25BA499613BE5551E1DB842&selectedIndex=2&ccid=0ojY3e72&simid=607994485072072529&thid=OIP.Md288d8ddeef62b5b4f318f8cb6989142o0&ajaxhist=0
Or you could use Epsom salt for PH down / Baking Soda for PH up
To Chlorinate use Spa 56 here is a picture.
https://www.bing.com/images/search?q=spa56&view=detailv2&&id=43ACD142A199D72109AEBF507AF4E3FFB6497BC7&selectedIndex=4&ccid=JLX%2bTTGE&simid=607988987501022242&thid=OIP.M24b5fe4d31843755bdf1b28803b88597o0&ajaxhist=0