You can use those, if copper is not listed as an ingredient. But you MUST get an OTO / phenol red kit of some kind, and start using it. Since that stuff is in a 1lb bag, you'll need a freezer bag you can empty it into, and a 1/8 cup plastic measure to dose with. Add 1/8 cup, and CHECK your chlorine 30 minutes later. Dark yellow is OK. If it's orange, wait till the sun has been on it several hours. If it's LIGHT yellow, use 1/4 cup (2x 1/8 cup) next time.