I was in the middle of shocking the pool because of algae, I left it in the good hands of my DH for 24 hours while I was out of town, he kept up with the procedure but didn't notice the algae on the stair steps that were in the water or the fact that the skimmer was totally popped out of the water....so it was NOT circulating for possibly 24 hours. I've never had such visible growth on the steps, should I throw them away or can I scrub with a brush and bleach? I have removed them from the pool for now. Thanks!