Meanwhile, your chlorine for that level CYA should be adequate, but you need to test it, I'd say, at least twice a day until you have sufficient stabilizer to keep the UV from devouring your chlorine.

BTW, your chemicals will last longer if you test 10ml of water rather than 25ml. Each drop of the test will then measure .5 rather than .2 and you'll use less. You don't need any greater accuracy than that.

Carl