I am at work right now, so I don't have the numbers for our pool, but we have been battling mustard algae off and on for several weeks now. I do know our CYA level is about 50, and on a daily basis I try to keep chlorine at about 4ppm, due to dirty kids, lots of wind and what were incredibly hot temperatures for weeks at a time.
I think a couple of times due to weekend trips it must have dropped too low and let the algae get started, normal shock levels of 15 ppm would knock it out, but it would come right back as soon as we dropped back down to normal levels.
So for the last 4 days I have been keeping the chlorine incredibly high, I forget the PPM that the pool calculator told me to use for mustard algae, but I believe it was 296 oz. of Bleach for my 15foot intex pool, to go from 5 ppm to Mustard algae levels
Finally the water is not yellow or green, but it is cloudy as heck. Yesterday morning, after vacuuming to waste as much as I could, I cleaned the filter, added bleach to get back up to Mustard Algae shock levels, let the pump run all day and then added a dose of clarifier to try to get some of the super fine muck to stick together.
I also soaked and scrubbed all pool equipment, ladders, toys etc etc.
I plan on keeping the shock levels up another 24 hours, then checking for OCLLT, and balancing PH and all that good stuff.
Here is my problem, we are leaving Friday afternoon and won't be back until Sunday night or Monday morning. I am worried that by leaving the chlorine levels will drop too low and the algae will come back!! We are going with our whole family that is in town, and I really don't know if there is someone I can get to come by and dump bleach in the pool???