After my last trip to Leslies. They tested my water because I accidently let my inline run out of tabs and the water was cloudy. They said my cya was 90 and my calcium was low. Chlorine was non existent. TA and PH were fine. While sweeping the steps i noticed a light dusting of what I'm guessing is algae. I added half the water hardness they perscribed and now show according to my kit, 500. I give up. I just ordered my K-2006 and should be in Friday. I'm going to drain 2ft of water and refill tomorrow. What will be my first steps?