I use 10% chlorinated liquid purchased from Lowe's with good results. Test hold true after adding.
My daily cost of adding it is around $1.29 daily (adding around 5 cups daily)
I'm losing about 2 to 3 ppm daily with only 0.5-1ppm lose overnight. CYA around 30-35. Thinking about bumping up CYA to around 40-45 to get better protection on FC. Water is crystal clear. What do you think?