Include me in the ranks of those battling mustard algae, in the shallow.shady end of pool. A couple of years ago I posted about re plaster issues I had with my contractor. Marbling and pitting shortly after the job, it's in this area of the pool I am now fighting mustard for the second seasno. Have shocked at 24, brushed daily and within days the algae was back. FC levels one week after shock still high at 9.
CH 350+ (high since botched plaster job)
Is the faulty plaster an issue? Not ready to add copper....have a great success with TFP!