How long after adding alkalinity can you swim safely?
If you're staring at your pool on a scorching afternoon wondering how long after adding alkalinity can you swim, the good news is you won't have to wait all day. Generally speaking, you should wait about 20 to 60 minutes after adding an alkalinity increaser before jumping back into the water. It's not as strict as adding shock or heavy-duty algaecides, but you still want to give the chemicals a chance to mix thoroughly so you don't end up swimming through a cloudy patch of "buffer" that hasn't dissolved yet. ...