Does this completely stop the flow through the bottom drain?
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No, the main drain isn't actually a drain in the sense that it drains the water out of your pool. Instead, it's an outlet that sucks water through a skimmer then through the filter, and back to the pool.
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Does this Olympic drain cover replace the vortex ones that the pool cleaners always get stuck on?
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No, we really need to know what your original was.
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You might consider trying this Polaris UniCover which is designed to go over your current cover to prevent pool cleaners from getting stuck on drain covers.
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