The process seems right... but the results are problematic.fernandoj said:follow the instructions the first one change color after 12 drops x 0.5= 6 as FC?
then I add the 5 drops of R 0003, turns pink again, and add the r 0871, turns colorless after 15 drops x 0.5= 7.5 CC
Are you sure you used a 10 mL sample? That's one of the lowest lines on the sample tube.
If correct, that would mean a Total Chlorine level of about 13.5 -- in addition to lowering your pH to 7.4 - 7.7, you're going to need a lot of bleach (liquid chlorine) to oxidize your Combined Chlorine (CC). Not sure if shocking is appropriate for brand new plaster pools, so I defer to those wiser on this forum to provide that answer.