We’re getting many calls the past two weeks following the two weekends of storms to help with algae in pools. Here’s one that two weeks ago was suffering from black algae. Black algae is one of the hardest to treat as its roots can grow into the plaster or concrete. It also develops a protective layer to protect itself from chlorine. Firstly, its not just chlorine to balance, you need to ensure pH is 7.4 – 7.6 and alkalinity is between 120 – 150ppm. Next hard vigorous brushing of the entire pool to break it down. Then, shock, for 3 – 4 days, then, to ensure its completely killed, ‘black out’. You will then need to continue to treat the pool, brush regularly and balance the chemicals correctly. Here’s one we took on two weeks ago and the result after our expert work.