I had a CYA reading of 20-30 last fall at closing. Typically when I open up in the spring the CYA is 0 so I am assuming that is the case this year as well. I have the DPD powder test kit that was sold with the test you kit you used to sell via this site. But I have read where it can't test above 15 PPM so I haven't done that test yet. If I have CC what do I need to know.