OK,,Things have been going great, the water is very close to being perfectly clear. I have been trying to gradually raise my CL level. I started last Thursday adding 1 cup every 12 hrs of cal hypo. I test every time prior to adding. First three days basically no change in the levels. (but I've stayed safe by adding the polyquat). Then bumped up the dosage by going 1-1/2 cup each time again every 12 hrs, level rose to .5. Yesterday I began to add 2 full scoops 3 x a day. last night my reading was still .5

In the morning I backwashed and then added 3 scoops. (It was 95 degrees here all week including today) I just tested and my CL level is now 10 ! , and the water is also a bit cloudy. I really tried to avoid this sudden rise. I might just be paranoid I think the steps are getting darker.

Should I add something to quickly lower the CL?

I wonder if there is something going on with the filter that would have released a bunch of cal hypo after backwashing?