I've run into a handful of pools recently with a small amount of mustard algae growing on the wall, or steps. Its called mustard algae, because of its greenish/yellow color. Unfortunately it's common to see algae growing in pools this time of year. With warmer temperatures and the fresh feeling of spring, it starts to get windy, or even breezy for days at a time. Flower pollen covers the surface of the water and the dying leaves are falling from the trees as summer approaches. All of these factors all contribute to algae growth. In pebble tech pools, black algae will start to grow on the wall, along the water line, where the pollen is clinging to the pebble tech. Or mustard algae on the wall where dirt had recently been blown into the pool.
Im often surprised to see that algae can survive in the winter, in chlorinated water with a good pH and alkalinity reading, even in temperatures below 55 degrees fahrenheit. Sometimes it's just necessary to add a phosphate remover, to kill off the algae's food source, then I add an algaecide to make the water even less hospitable to the organism. I like an ammonia based algaecide, because copper based products often stain plaster and cleaner hoses purple, requiring an acid wash by a good pool guy to remove the stains. If the algae growth keeps reoccurring, I have been using a mineral rod called Pool Rx. That goes in the pump basket and charges the water with minerals. Water flow thru the basket recharges the water for up to 6 months. I had good luck with that last year when algae kept coming back.
Im often surprised to see that algae can survive in the winter, in chlorinated water with a good pH and alkalinity reading, even in temperatures below 55 degrees fahrenheit. Sometimes it's just necessary to add a phosphate remover, to kill off the algae's food source, then I add an algaecide to make the water even less hospitable to the organism. I like an ammonia based algaecide, because copper based products often stain plaster and cleaner hoses purple, requiring an acid wash by a good pool guy to remove the stains. If the algae growth keeps reoccurring, I have been using a mineral rod called Pool Rx. That goes in the pump basket and charges the water with minerals. Water flow thru the basket recharges the water for up to 6 months. I had good luck with that last year when algae kept coming back.
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