The CC reading immediately before adding the CL was zero.The water has been in spa for 3 weeks and I have only used the spa 6 times and always after a shower so there would be no lotions or sweat. It is always covered when not in use and the filter is on 24. No other chemicals have been used. When testing I fill the plastic container to the 1st mark from the bottom and use the.2 muliplier. Sorry if a gave the wrong # asI always use that mark and its been awhile since I looked at the scale numbers. Too late, as the water looked sparkling I already dumped it in the pool a couple hours ago. The pool reading is 3.0 on FC and less than 1 CC. It was zero yesterday, so tonight I'll pour half gall of CL.This is a mystery as the highest reading for CC in the spa has been 1.0 and that is when the water starts to look cloudy.