Hi, Im new to this site, and sooooo glad i found it. To make a long story as short as possible......
Pool: 20x40 (8ft deep end) Ph and TA have always been within range, CH 150, (pool store told me my phosphates were high range)
High CYA 120+ (to late in season to drain and fill, pool will be closed soon, well water a pain too. I did try draining/fill about 6in, then had to deal with metals mixed with high chl )
Green algae tackled and hopefully I won ( 21 gallons of 12.5% bleach added at 3-6 gallons at a time over 2 weeks, very pretty and clear today)
My problem is I tested the FC (FAS-DPD) twice, and got different readings so i tested again and again and still... all different readings. I did this in the evening and the early morning. I am using the TF-100, (thank you for fast delivery). My FC readings go from 17 to 24, which when im doing the overnight test, i dont know which one is right or what to compare. Though after each reading when i add the 5 drops to test for CC, the water stays clear, which is good right, but if i keep getting different FC numbers when i triple check myself, how will i know if i am truly in range of FC 9-15 (Is that correct range for CYA of 120) What am i doing wrong??