A little misunderstanding when I said CA I meant Cyanuric Acid not calcium though I know that Ca is the chemical symbol for calcium my mistake. We are awaiting our drop test. It was supposed to be here a couple of days ago, we are still waiting. The first 5 lbs of CYA has been in the pool for 2 weeks and the remaining 12 for 5 days. We did not back wash after the first 5 lbs. We waited for 3 days after the 12 lbs was added per the instructions on the tub. The only reason I back washed was the filter gauge was showing almost 30 psi over twice what it normally runs. Hopefully the drop test will show some CYA in the pool. I do not want to run the chlorinator at 100% forever, but I also do not want a crappy pool or to have to continue to add liquid Cl.