Originally Posted by Rob621
I just had a similiar issue with my pool. Seems that the water was clear.
Chlorine FC and TC was 3
pH wa 7.8
TA was 110
I started to notice green patches between the tiles below water level as well as dark dirt stains on the floor and walls of the pool.
I swept but it seemed not to remove the stains. I used a water hose with a power head and that helped but after a day the stains would return.
I decided I must have green algae and took the following steps.
I needed to lower pH to 7.6 (mandatory before adding algae killer) and did this by adding acid over a 12 hour period while running my pump.
Then I shocked my pool to bring chlorine level up to 5. (mandatory before adding algae killer) One 1lb bag of Leslie's Chlor Brite did the trick.
My SWG is set at 50% at the moment.
I then added 16oz of AquaChem 50% green algae killer around the edges of the pool.
I circulated water for about and hour and the dark stains were now sweepable and moved as a cloud to the main drains.
I then swept the walls and the bottom of the pool totally.
The pool water became cloudy and directions said this is normal after the algae starting to die.
At present time I'm running my pump for a full 24 hours and will continue to sweep all areas.
When water gets clear I plan on removing my filters and cleaning them.
I feel confident that I have solved my issue and will check back and check all pool numbers.