salt water Swiming pool. Black spots.?

Its a 20KG pool, Aqua Rite salt system in Houston,Tx. I keep on having black dots, I scrub regulary, Salt is at 3300, the blades were cleaned twice in the last 2 month. The pumps are running for 7 hours/ day. Black spots are persistance specially in the deep. what could be causing it?

Could be the beginnings of black algae. Here's how to tell. Swim down to one of the spots and -using a good bit of pressure- rub your finger across it. If it feels slimy and leaves a "pencil streak" then you've got yourself a dose of black algae. It is difficult, but not impossible, to get rid of. I suggest you go to a pool store and ask their advice on the appropriate algaecide to use. Silver algaecide does wonders, but has to be used properly to avoid turning the entire pool to "ink"! Also invest in a good stainless steel algae brush, as you will be doing a lot of scrubbing. Black algae grows layer upon layer. As the top layer is killed it will concrete over. You must scrub that layer off to expose the next layer down. Sort of "unstacking" the layers. Hope this helps. By the way, if it isn't black algae e-mail me and we can discuss other ideas/solutions.

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