Greetings and Happy Spring to everyone! I need to slam my pool. I have done it before with great success. However, my CYA level is at 0 and I have never slammed at a 0 level. Should i bring my CYA up to 30 before starting the slam? I just took the cover off today. The water is clear but the sides and bottom are green and the FC level is 0. Thank you for any advice at all. I apologize, I think i posted this under the wrong thread.