Update from the OP. My algae is dead and the water is crystal clear again, I just have a lot of dead algae lying at the bottom. The robot has slurped most of it up, so the pool is just waiting for its indolent owner to get in there with the vacuum. But the thing is, I had to triple dose the pool to knock the algae down, which begs the question - I pay $$$ for good quality algacide which has always worked in the past, are the suppliers now diluting the stuff - or is the algae becoming resistant? Note, I buy the chems from a 'popular online pool specialist'.
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