The 18″ pool brush attaches to the telescoping pole and is used to brush the sides and bottom of the pool good for algae. DO NOT use metal brushes on vinyl liners. REFUND POLICY is as follows. For CPO Services, a refund will be given prior to 14 days of the class less a $35 cancellation fee and a 5 percent credit card charge. No refund will be given in the two week period before the start of the class. For products, refunds will be given on unopened returned merchandise within 30 days of purchase minus a 15 percent restocking. Shipping fees are not refundable.