Hello! Fred here....
Quick history. I am a new pool owner of about 3 weeks. I am grateful to find this site and have been reading posts religiously. I am following the BBB method and feel it is going well.
The pool I have sat for a year with no upkeep. It was a green mess. We have, however, gotten the water very clear. Let me post my levels and I will ask my question!
TC - 4
FC - 4
TA - 200
PH - 7.4
TH - 350
CYA - 70
16 x 32 - 3ft - 8ft depth, I am figuring approx 22k gallons
When the chlorine level gets to the 1 - 1.5 level, I have three stains that appear in the deep end, roughly 2 ft diameter in a irregular pattern. When I raise the chlorine level they fade and go away, but as soon as it drops to 1 they come back. I am now on my third day keeping the chlorine at a high level and plan to continue until tomorrow. On monday I added 7.5 gallons of 6% and have added that same amount each day. I add the chlorine in the evening and test the next evening before I add more. The level comes down to 4 - 5 by the end of the day.
Besides these three stains (which I hope the chlorine treatment will take care of), the liner has a dingy, dirty look over most of the pool. This dinginess does not brush off. The transition areas where the floor turns into a wall seem to be brighter than the floor or walls. The thing I noticed is that when I brush the liner and remove dirt or sediment has collected on the floor of the pool, where that dirt was is a brighter blue. The shape of the dirt or sediment is left in the liner as a bright blue shape. If dirt collects on a seam, when I brush the seam it is a nice blue seam. I have a feeling under this dinginess is a bright blue liner, I just don't know the next step to take. That is my question.... what should I do next?
Thanks for all the helpful posts.