get some vitamin c tablets and put them on the spots, might need to hold them down with a rock or brick (something without iron in it ) should lighten up the spots considerably. If you have to use the pump again I would put it in a bucket first
Mine did the same thing. I will try the vitamin C. This is in the deep end and I tried the brush but it didn't help much. When the pool is warmer I'll dive down and see what I can do if the Vitamin C doesn't help.
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