Pool Readings:
FC = 5
pH = 7.4
TA = 70 (Just added baking soda to bring it up to 90)
CH = 250
CYA = 50
Background:
Had pool replastered on June 2007. 10/2007 - 4/2008, covered pool and didn't attend to it over that time. April of 2008, cleaned the pool and kept it clean, except for 1 or 2 algae blooms until 10/2008. 10/2008-6/2009 reduced water level below skimmer several inches, covered pool and didn't attend to it over that time. Finally got it clean after considerable work (Refer to http://www.troublefreepool.com/diary-of-a-swamp-t15087.html). Since then I have kept it clean except for the occasional algae bloom which I dealt with quickly.
Problem:
Because of my actions the pool walls were stained from a couple inches below the skimmer down. The stain color was fairly consistent with a vague green tint. The stain has progressed to the point where the areas that covers over the old water line down several inches have turned dark green. Pictures are below.
Question:
I realize that letting it stay so green so long was a mistake and I will be keeping it clean year round from now on. My question is how to best clean the pool walls. I shocked the pool two weeks ago and have been brushing the pool but the stain remains. Algae blooms seem more common. Scrubbing with stainless steel brush has no effect. I also rubbed a puck on it for several seconds with no effect. Using a pumice stone did clean most of it up but I can't use that for the whole thing. Would an acid wash, pressure washing or something else be the best course of action?
FC = 5
pH = 7.4
TA = 70 (Just added baking soda to bring it up to 90)
CH = 250
CYA = 50
Background:
Had pool replastered on June 2007. 10/2007 - 4/2008, covered pool and didn't attend to it over that time. April of 2008, cleaned the pool and kept it clean, except for 1 or 2 algae blooms until 10/2008. 10/2008-6/2009 reduced water level below skimmer several inches, covered pool and didn't attend to it over that time. Finally got it clean after considerable work (Refer to http://www.troublefreepool.com/diary-of-a-swamp-t15087.html). Since then I have kept it clean except for the occasional algae bloom which I dealt with quickly.
Problem:
Because of my actions the pool walls were stained from a couple inches below the skimmer down. The stain color was fairly consistent with a vague green tint. The stain has progressed to the point where the areas that covers over the old water line down several inches have turned dark green. Pictures are below.
Question:
I realize that letting it stay so green so long was a mistake and I will be keeping it clean year round from now on. My question is how to best clean the pool walls. I shocked the pool two weeks ago and have been brushing the pool but the stain remains. Algae blooms seem more common. Scrubbing with stainless steel brush has no effect. I also rubbed a puck on it for several seconds with no effect. Using a pumice stone did clean most of it up but I can't use that for the whole thing. Would an acid wash, pressure washing or something else be the best course of action?
