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Does the pump keep the pool walls and bottom clean?

No. With proper chemicals and filter cartridge replacement, the pump will keep the pool clean from suspended water particles. A pool vacuum should be used to clean the walls and bottom of the pool. Additionally the INTEX KRYSTAL CLEAR TM Saltwater System and maintenance kits will keep your pool clean from algae and bacteria. Depending on the local characteristics of your water condition, it may be desirable to add water softeners, clarifiers, or algaecides.