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One reason is if you are using a copper ionizer this can casue a black coating anywhere on the pool. If this is not the case it could also be your pH off balance. Other than that I do not know.


AnswerI had black build up in the skimmer once. It was attributable to a forest fire in the mountains close by. The air had soot and ash and this settled down on the pool surface and eventually collected around the strainer.

I had the black build up also. I was using an algaecide from Walmart that was greasy and foamy. When the sugarcane farmers would burn the fields, the ashes would get caught in the oil of the algaecide. Once I switched to a better algaecide, the problem is not nearly as bad.

This can also be caused by traffic fall out for a time I had a hell of a lot of diesel traffic passing my front door. I have a floating pool skimmer and every time I happened to be standing next to the pool when the auto started it up at first a layer of black scum would build up in it. I thought it might have been from the traffic. I think I was proved right, when heavy traffic was diverted about a kilometer away the black scum stopped forming straight away.

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โˆ™ 2011-09-13 22:21:08
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Q: What causes a black build-up in the skimmer basket?
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Actually, they aren't a bad thing to remove all together. Skimmer flaps are a notorious place for algae, especially black or mustard, and bacteria to hide and grow, which makes reoccurance terribly probable. Removing them all together will not harm the performance of your pool. I beg to differ with the answer above - The skimmer works because the water jets create a flow which pushes the water past the skimmer. The skimmer is pulling water down which causes debris on the top of the water to get caught in the basket. The skimmer flap(s) limits the amount of water being sucked in by the skimmer causing more suction and making the skimmer more efficient. It is important for the skimmer doors, or "weirs" as they are called, to be in place for your skimmer to work properly. Try it for yourself. With the skimmer running, place your hand, a brick or some other obstruction where the skimmer door should be. Restrict the water flow a bit in some way. You will see a much larger volume of water being sucked into the skimmer than with no door at all. If you already have a flap or wier in place, do the reverse. With the skimmer running, hold the door completely open and see hose the flow virtually ceases. Replacement weirs or flaps can easily be found at your pool store. Just take your old one with you or measure the opening where it should sit. Little pegs on the sides of the replacements are spring loaded to keep it properly situated so it is very important that the new weir be exactly where you want it before pulling the pins securing the pegs. I hope this has helped!

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