Let me give you 2 different answers
Answer #1: In order to maintain your warranty rights against your pool contractor -- though we can all hope you won't need them -- brush the pool however the contractor said to brush. Do so, whether you 'need' to do so, or not. If you like, you can ASK your contractor if 'Shark-brushing' is adequate . . . but do your asking by email or s-mail, so you have a WRITTEN reply.
Answer #2: If the Shark 'brushes' the floor, then you don't need to do so. (I haven't watched one in operation, so I don't know.)
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