I converted from Baqucil last fall just before closing my pool. (4' X 24' Round AG, Pentair, Sand) I did a quick test of my water recently to see where I stand before pulling the cover off. My Ph is 7.2 and TA is about 170. My chlorine level understandably is 0 and my CYA level is also 0. The pool calculator is telling me I need about 3.0 lbs of CYA. My questions are: Should I try to bring the CYA level up by dissolving 3 pounds of CYA over a week or should I prolong this, say a pound a week for three weeks, and bring my chlorine level up comesurately or wait until the CYA level is where it needs to be and then attack the chlorine ?