I bought the house late last fall and the pool was open so I never closed it. I also didn't test during the winter but kept the pump going and tabs in the trichlor feeder.

Since opening used Jack's Magic copper and scale stuff to remove a calcium build up over iron staining. I have since used an asorbic acid "stain free" twice to remove a rebuild of stains around nozzles, on steps, and pool sides and used approximately 3 bottles of jacks blue stuff. I have kept trichlor 3" tabs running continuously. I have shocked the pool once per week until this past week when it would not hold free chlorine. Early in the week used approximately 10 lbs of shock, still would not hold FC. Pool supply company suggested OxyShock. Used 4 lbs Wednesday evening - I understand it can give a false CC level. I also changed the sand in the Hayward filter this past weekend. I just tested the pool water a 3:15 with the following readings of FC and CC

FC - 0
CC 16
Ph 7.0
Alkalinity 120

=========================

Chemicals on hand: 40 lbs of shock with no stablizer. 4 lbs of Ph increaser. 8 lbs of Alkalinity increaser. 2lbs of stain free and two bottles of sequestering agent called "metal out".